Infrared Light Therapy Devices Series

Wavelength and Phototherapy
Phototherapy, also known as light therapy, employs specific forms of light to treat medical conditions and improve overall health. By understanding how different wavelengths operate in these treatments, we can better appreciate their impact and applications.

Principles of Phototherapy
Phototherapy operates based on several key principles:


Interaction with Skin: Light penetrates the skin layers to stimulate cellular functions.
Specific Wavelengths: Different wavelengths yield specific therapeutic effects.
Biomodulation: Alters biological processes to promote healing, reduce inflammation, and improve circulation.

Mechanisms of Action
Understanding the mechanisms by which light interacts with biological tissues is crucial for comprehending phototherapy. When we delve into this process, we uncover various ways light can influence cellular function and overall tissue health.




Photoreceptors

Photoreceptors are specialized molecules or proteins within cells that absorb light. When we expose these photoreceptors to specific wavelengths, they undergo conformational changes, initiating a cascade of cellular events. For instance, chromophores like cytochrome c oxidase in mitochondria absorb light, enhancing cellular respiration and ATP production.
Photobiomodulation

This term refers to the biological effects that light has at the cellular level. When cells absorb photons, several processes are triggered:

ATP Synthesis: Light can stimulate mitochondrial activity, leading to increased synthesis of adenosine triphosphate (ATP).
Nitric Oxide Release: Light exposure can trigger the release of nitric oxide (NO), which enhances vasodilation and improves blood flow.
Reactive Oxygen Species (ROS): Controlled light exposure generates low levels of ROS, which act as signaling molecules to trigger cellular repair and regeneration processes.


Light Absorption and Penetration Different tissues absorb light to varying extents, depending on the wavelength used. For example:

Visible Light: Penetrates skin tissues and is absorbed by chromophores in the dermal layers.
Near-Infrared Light: Penetrates deeper into tissues, reaching the subcutaneous layers and even muscle tissues, allowing for more profound therapeutic effects.


Cell Signaling Pathways Upon absorbing light, cells activate various intracellular signaling pathways. These pathways include:

MAP Kinase Pathway: Involved in cell growth, differentiation, and survival.
NF-kB Pathway: Plays a role in immune response and inflammation regulation.
JAK/STAT Pathway: Essential for cell proliferation and apoptosis regulation.


Tissue Response

The interaction between light and tissues culminates in a variety of responses, such as:

Enhanced Cellular Proliferation: Promotes tissue repair and wound healing.
Inflammation Modulation: Reduces inflammatory cytokines, aiding in pain relief and recovery.
Collagen Synthesis: Stimulates fibroblasts to produce collagen, improving skin texture and elasticity.



In summary, our comprehension of these mechanisms enhances the efficacy and safety of phototherapy treatments, paving the way for innovations in medical and aesthetic fields.

Understanding Light Wavelengths
In the realm of phototherapy, the primary focus is on light wavelengths and their distinct properties. Wavelengths of light determine the color we perceive and play a critical role in therapeutic applications. Each wavelength corresponds to a specific color within the light spectrum, ranging from ultraviolet (UV) to visible light to infrared (IR).



The Light Spectrum

Ultraviolet (UV) Light:

Wavelength: 100-400 nm
Properties: Higher energy; can penetrate the skin and affect cells at deeper levels.
Application: Often used in treating skin conditions like psoriasis and vitiligo.


Visible Light:

Wavelength: 400-700 nm
Properties: Perceived as colors ranging from violet to red.
Key Segments:

Violet/Blue Light (400-500 nm): Known for its antibacterial properties and used in acne treatment.
Green Light (500-570 nm): Used for pigmentation issues and calming irritated skin.
Red Light (620-700 nm): Promotes collagen production and accelerates wound healing.




Infrared (IR) Light:

Wavelength: 700 nm – 1 mm
Properties: Deep-penetrating; commonly used for its therapeutic effects on muscles and joints.
Application: Effective in reducing pain and inflammation in phototherapy treatments.



Key Properties of Wavelengths

Energy and Penetration:

Shorter wavelengths (UV) hold more energy and are capable of penetrating the skin more deeply, impacting cellular processes more intensively.
Longer wavelengths (IR) penetrate even deeper but with less energy, making them ideal for muscle and tissue therapy.


Therapeutic Effects:

Each wavelength affects the body differently, thus the selection of wavelength is critical for desired therapeutic outcomes.
For instance, blue light’s anti-inflammatory properties help in treating acne, while red light’s ability to stimulate collagen production aids in anti-aging treatments.



Emerging Technologies
We are also looking into emerging technologies and custom wavelengths tailored for specific medical conditions.

Excimer Laser (308 nm):


Provides targeted treatment for small areas affected by psoriasis and vitiligo.
Minimizes exposure of healthy skin to UV radiation.

LED Therapy:


Provides more controlled delivery of light compared to traditional UV lamps.
Use of LEDs allows for the combination of different wavelengths tailored for individual treatment plans.

Understanding these properties allows us to tailor phototherapy treatments to target specific conditions effectively. The selection of light wavelength is not arbitrary, but a deliberate decision based on the desired therapeutic outcome and the condition being treated.

Red Light Wavelength
Red light therapy has emerged as a promising phototherapeutic technique, offering a range of benefits and versatile applications. We delve into critical aspects to understand its impact:

Benefits of Red Light Therapy

Enhanced Cellular Function: Red light therapy energizes cells by boosting ATP production, facilitating cellular repair and growth processes.
Reduced Inflammation: Anti-inflammatory effects help in alleviating chronic inflammation, which can lead to conditions like arthritis and tendinitis.
Improved Skin Health: Promotes collagen production, aiding in the reduction of wrinkles, scars, and acne. This makes it a popular choice for cosmetic applications.
Pain Relief: Effective in managing pain by reaching deep tissues and promoting blood flow, making it a valuable tool for muscle recovery and injury treatment.
Accelerated Wound Healing: Speeds up the healing process of superficial and deep tissues, crucial for post-surgery recovery and injury management.

According to the International Commission on Non-Ionizing Radiation Protection (ICNIRP), the guidelines indicate that the electromagnetic field (EMF) levels from LED lights are well below the safety thresholds.

Blue Light Wavelength
In the realm of phototherapy, blue light therapy holds a significant place due to its myriad of benefits and wide range of applications. We explore its contributions to both medical and cosmetic treatments, highlighting its importance.

One of the primary benefits of blue light therapy is its effectiveness in treating skin conditions, notably acne. This therapy targets the Propionibacterium acnes bacteria, a common cause of acne, by emitting specific wavelengths that destroy these bacteria. By reducing the bacterial presence, blue light therapy significantly decreases acne outbreaks, leading to clearer and healthier skin.

Another important application lies in its use for seasonal affective disorder (SAD). SAD, a type of depression that follows a seasonal pattern, is often treated effectively with light therapy. Blue light, in particular, has been shown to help regulate our circadian rhythms by simulating sunlight, thereby improving mood and energy levels during darker months.

We also see blue light therapy being used in the treatment of certain skin conditions. Psoriasis and eczema patients often experience relief through this method, as blue light can reduce inflammation and slow down the rapid growth of skin cells. This leads to a reduction in flare-ups and an overall improvement in skin appearance.

Moreover, blue light therapy plays a role in wound healing. The specific wavelengths used can enhance tissue repair mechanisms, promoting faster recovery of wounds and reduction of scars.

In dentistry, blue light is utilized for curing dental resin. When applied, the light hardens the resin more rapidly than traditional methods, ensuring sturdier repairs and shorter treatment times.

We should also consider the anti-aging effects of blue light therapy. By stimulating the production of collagen, it aids in maintaining skin elasticity and reduces the appearance of fine lines and wrinkles.

Near-Infrared Light Wavelength
Near-infrared light therapy (NIR) is a rapidly advancing field offering numerous benefits and applications. As part of the broader spectrum of phototherapy, NIR focuses on wavelengths between 700 and 1200 nanometers (nm). We recognize its potential in various medical and cosmetic treatments.

Benefits of Near-Infrared Light Therapy

Pain Relief

NIR light therapy is effective in reducing pain and inflammation. By penetrating deep into tissues, it aids in alleviating chronic pain conditions, such as arthritis and fibromyalgia.


Wound Healing

NIR promotes tissue repair and accelerates wound healing. The light stimulates cellular processes, leading to faster regeneration of damaged tissues.


Muscle Recovery

Athletes and fitness enthusiasts benefit from NIR therapy for muscle recovery. It enhances blood flow and reduces muscle soreness post-exercise.


Skin Rejuvenation

In dermatology, NIR light therapy is utilized for anti-aging purposes. It boosts collagen production, improves skin elasticity, and reduces the appearance of wrinkles.



Clinical Studies and Specific Wavelengths
We have seen significant advances in the field of phototherapy, due in part to the detailed clinical studies focusing on specific wavelengths. These studies provide the scientific validation essential for the development of phototherapeutic techniques.

Key Wavelengths in Phototherapy

UV Light (100-400 nm):

UVA (315-400 nm): Used primarily for Psoriasis treatment, often in conjunction with Psoralen (PUVA therapy).
UVB (280-315 nm): Effective for skin conditions like eczema and vitiligo. Narrowband UVB around 311 nm is increasingly preferred due to reduced risk of skin damage.
UVC (100-280 nm): Limited medical application due to its skin-damaging potential but useful in sterilizing medical equipment.


Visible Light (400-700 nm):

Blue Light (450-495 nm): Demonstrated effectiveness in treating neonatal jaundice and acne. Studies indicate bactericidal properties.
Red Light (620-750 nm): Utilized in wound healing and pain relief. Clinical evidence supports its role in enhancing cellular regeneration processes.


Infrared Light (700 nm – 1 mm):

Near Infrared (NIR, 700-1400 nm): Investigated for deeper tissue penetration. Used in muscle recovery therapies and alleviation of inflammation.
Far Infrared (FIR, 15 µm – 1 mm): Studies show promising results in improving cardiovascular health and promoting detoxification processes.



Clinical Trial Highlights

UVB for Psoriasis: A controlled trial involving 300 patients showed that narrowband UVB significantly reduced lesions with an 85% clearance rate after 24 sessions.
Blue Light for Acne: A randomized study with 120 participants demonstrated a 60% reduction in acne lesions after eight weeks of bi-weekly blue light therapy.
Red Light for Healing: Clinical trials on diabetic foot ulcers revealed that red light therapy accelerated healing, with 70% of participants showing complete ulcer resolution within 12 weeks.
Near Infrared for Pain: In a study involving 200 patients with chronic joint pain, NIR phototherapy reduced pain scores by an average of 40% over a three-month period.

These clinical findings underscore the role specific wavelengths play in optimizing phototherapy for various medical conditions. By tailoring wavelengths to target tissues and conditions, we can devise more effective and safer treatments.

Phototherapy vs. Other Healing Modalities
Phototherapy represents an evolving and promising approach in the realm of medical treatments. However, it is essential to understand how it compares to other established healing modalities. By examining the benefits, mechanisms, and applications of phototherapy alongside other treatments, we aim to provide a comprehensive perspective on its efficacy and potential.




Modality
Mechanisms of Action
Benefits




Phototherapy
Utilizes specific wavelengths of light to penetrate the skin and trigger cellular processes that promote healing and regeneration. Targets conditions like psoriasis, acne, and SAD.
Non-invasive, minimal side effects, specific tissue targeting, relatively quick treatment sessions.


Pharmacotherapy
Uses drugs administered orally, intravenously, or topically to achieve desired therapeutic effects.
Broad spectrum of applications, powerful effects, proven efficacy for numerous conditions.


Physical Therapy
Emphasizes physical interventions like exercise, massage, and manual manipulation to enhance rehabilitation and relieve pain.
Improves strength, mobility, and function through naturalistic means; promotes overall well-being.


Alternative Therapies
Encompasses acupuncture, homeopathy, and herbal medicine, using non-conventional methods to promote wellness and treat various ailments.
Holistic approach, focus on natural remedies, alignment with personal beliefs and preferences.



Future Directions: The Next Frontier in Light Therapy
As we explore the next frontier in light therapy, understanding the potential advancements in this field is essential. We are witnessing significant innovations poised to enhance the efficacy and applications of phototherapy. Key areas of focus include:


New Wavelength Discoveries: Investigating new wavelengths beyond the current red and blue light spectrums. Emerging research suggests that ultraviolet, infrared, and green lights may hold untapped therapeutic potential.
Expanded Applications: Exploring new medical and non-medical applications. Phototherapy’s versatility can extend to mental health treatment, immune system modulation, and enhanced athletic performance.

Conclusion: The Potential of Phototherapy to Healthcare
We believe that the advancements in phototherapy underscore a transformative potential for healthcare. By harnessing the power of specific wavelengths, new avenues for treating various conditions emerge, offering non-invasive and effective solutions. Phototherapy’s ability to precisely target affected areas minimizes collateral damage to surrounding healthy tissues.


Versatility of Treatments: Dermatological Applications, Mental Health, Pain Management.
Safety and Efficacy: Minimal Side Effects, Non-Invasive Nature.
Innovations and Future Directions: Precision Medicine, Portable Devices, Combating Antimicrobial Resistance.
Multidisciplinary Impact: Integrative Approach, Education and Training.

We witness an era where phototherapy’s nuanced applications lead to groundbreaking improvements in patient care, promoting a shift towards more personalized and responsive healthcare solutions.

Table of Contents
Wavelength and PhototherapyUnderstanding Light WavelengthsRed Light WavelengthBlue Light WavelengthNear-Infrared Light WavelengthClinical Studies and Specific WavelengthsPhototherapy vs. Other Healing ModalitiesFuture Directions: The Next Frontier in Light TherapyConclusion: The Potential of Phototherapy to Healthcare

Last updated: August 3, 2026 | 13-minute read

Rehabilitation light therapy is sometimes described as a form of heat treatment. That comparison is incomplete. Photobiomodulation therapy (PBMT) is intended to deliver a controlled, non-ionizing optical exposure that produces photochemical and signaling effects rather than relying on heat as the therapeutic mechanism. A device may still warm during use, so optical output and temperature both need to be measured and managed.

Rehabilitation light therapy commonly uses red and near-infrared wavelengths. Photons may interact with mitochondrial and non-mitochondrial chromophores, including cytochrome c oxidase, and influence nitric-oxide, redox, and cellular signaling pathways. These are proposed mechanisms, not proof that every device, dose, or condition will produce the same clinical outcome. Current evidence varies substantially by indication and treatment parameters.

This guide explains the underlying science, the rehabilitation areas in which PBMT has been studied, and the engineering parameters used to compare devices. It is an educational and procurement-oriented overview, not a treatment protocol or substitute for a qualified healthcare professional's judgment.

What rehabilitation light therapy actually is — and how it may work at the cellular level

Clinic-use red light therapy panel

Rehabilitation light therapy is usually discussed within the broader field of photobiomodulation therapy, or PBMT. PBMT uses controlled optical radiation—often visible red or near-infrared light—to modulate biological responses without intentionally producing tissue damage. Frequently studied wavelengths include bands around 630–680 nm and 780–950 nm, but wavelength alone does not define a valid protocol.

One leading mechanistic hypothesis involves absorption by mitochondrial chromophores, including cytochrome c oxidase. Downstream effects may include changes in electron transport, nitric-oxide availability, ATP production, reactive oxygen species signaling, gene expression, and inflammatory pathways. The direction and magnitude of those responses depend on wavelength, irradiance, exposure time, tissue type, and biological state. The mechanisms therefore should be described as under continuing investigation rather than as a single, fully established pathway. Hamblin's review in Photochemistry and Photobiology discusses mitochondrial and redox signaling while also emphasizing the complexity of the response (DOI: 10.1111/php.12864).

The terminology has changed over time. "Low-level laser therapy," "low-level light therapy," "cold laser," and "photobiomodulation therapy" often overlap, but the light source and dosimetry still matter. A laser and an LED array can both be used for PBMT, yet they may differ in beam geometry, coherence, treatment area, power distribution, and application method. Anders, Lanzafame, and Arany recommended "photobiomodulation therapy" as the preferred umbrella term in 2015 (DOI: 10.1089/pho.2015.9848).

PBMT should also be distinguished from other light-based modalities. UV phototherapy, blue-light acne systems, bright-light devices used for circadian applications, photodynamic therapy, and infrared heating devices have different intended effects, hazards, and regulatory pathways. Parameters from one category should not be transferred automatically to another.

How rehabilitation settings use and study light therapy

Sports medicine practitioner treating shoulder injury alongside post-surgical rehabilitation ward with floor-standing PBMT panel

PBMT has been studied as an adjunct in several rehabilitation contexts. The strength of evidence is not uniform, and results from one condition should not be generalized to another.

Common research areas include:


Musculoskeletal rehabilitation — research has examined outcomes such as pain and function in selected tendinopathies, osteoarthritis, neck pain, and other musculoskeletal conditions.
Post-procedure and post-surgical support — studies have explored pain, inflammation, edema, and tissue-recovery outcomes after specific procedures, but findings and protocols are procedure-specific.
Neurological rehabilitation — PBMT has been investigated for peripheral nerve and neurological applications, although the evidence is more heterogeneous and many uses remain investigational.
Chronic pain management — studies have evaluated several chronic pain conditions, but effect estimates and certainty vary by diagnosis and outcome.

Does red light therapy really help with recovery? A defensible answer is that PBMT appears beneficial for some outcomes and conditions, but the overall evidence does not support a universal recovery claim. A 2025 umbrella review of randomized clinical trials found moderate-certainty evidence for a limited number of outcomes, while many other outcomes were supported by low- or very-low-certainty evidence. Device parameters, treatment methods, comparators, and study quality remain major sources of heterogeneity (see Son et al., 2025).

The World Association for Photobiomodulation Therapy (WALT) publishes professional recommendations for defined applications. Its musculoskeletal tables are source- and wavelength-specific—for example, Class 3B lasers at 780–860 nm or 904 nm—and commonly express energy per treatment point. They should not be treated as universal LED-panel dose tables or converted directly into instructions for every device. Application remains the responsibility of the treating professional and must follow the authorized labeling of the device.

PBMT should be presented as a possible adjunct, not a replacement for diagnosis, exercise-based rehabilitation, medication, surgery, or other indicated care. A complete ligament rupture, infectious bursitis, postoperative complication, or progressive neurological condition requires appropriate medical assessment regardless of whether PBMT is being considered.

Localized versus large-area applications
Treatment area is an engineering and workflow consideration, not evidence of efficacy by itself. A small-aperture device delivers light to a limited surface, while a panel covers a larger area. Comparing them requires more than peak irradiance: active treatment area, spatial uniformity, spectral output, distance, exposure geometry, and thermal stability all matter.

A product should be used only for its documented intended use. Specifications from an intranasal, facial, cosmetic, or wellness device cannot be used to justify a musculoskeletal or neurological application unless the applicable labeling and regulatory documentation support that use.

Large panels may be convenient for broad surface coverage, but surface coverage should not be confused with a known dose at a deep anatomical target. Reflection, scattering, absorption, skin pigmentation, tissue thickness, and anatomical geometry all affect how much optical energy reaches deeper tissue.

The same principle applies to facial devices. A mask designed for dermal use may have fixed geometry and relatively short LED-to-skin distance, whereas a rehabilitation panel may operate at a larger, adjustable distance. The two formats require different safety assessments and cannot share dosing assumptions simply because they use similar wavelengths.

Understanding irradiance, wavelength, and radiant exposure

Labeled diagram of red NIR LED panel showing wavelength, irradiance, treatment distance, and dose callouts

For a stable continuous output, incident radiant exposure can be estimated with this equation:

Radiant Exposure (J/cm²) = Irradiance (mW/cm²) × Time (seconds) ÷ 1000

This calculation describes optical energy incident on the measurement plane. It does not calculate the absorbed dose inside a tendon, joint, muscle, or other deep target. For pulsed output, the calculation must use time-averaged irradiance or integrate the output over time. For multi-wavelength devices, total irradiance and the contribution of each wavelength should be reported separately where relevant.

Before comparing a product with published research, confirm at least these four items:


Irradiance at the actual working distance — use a calibrated, spectrally appropriate instrument and report the measurement method. A single center-point peak should not be presented as the average across a large treatment area.
Spatial uniformity and spectral output — document the measurement grid, average, peak, minimum, uniformity calculation, wavelength peaks, and output ratio between channels.
Output after thermal stabilization — preheat the device to a defined steady state and record whether irradiance, spectrum, and surface temperature change during a typical operating period.
Applicable safety and performance documentation — for a non-laser medical light-source device, IEC 60601-2-57:2023 may be relevant depending on intended use, classification, and market. IEC 62471 addresses photobiological hazards for lamps and lamp systems. Applicability must be determined for the exact product and jurisdiction.

IEC 60601-2-57:2023 addresses basic safety and essential performance of non-laser light-source equipment intended for therapeutic, diagnostic, monitoring, cosmetic, or aesthetic use. It is not a clinical-efficacy standard. A statement of compliance should be supported by the applicable test report, exact model identification, standard edition, tested configuration, and laboratory information—not merely by listing the standard in marketing copy.

Optical design affects the irradiance pattern. A 30-degree lens generally produces a narrower beam than a wider-angle optic, which may reduce divergence over a defined distance. It does not make irradiance independent of distance. A device such as the T1 desktop panel may be specified at 35 mW/cm² at 15 cm, but that value should be treated as a measurement tied to the stated test setup. The beam angle alone does not prove the result.

Wavelength selection in rehabilitation research
Red wavelengths are generally absorbed more strongly in superficial tissues, while some near-infrared wavelengths may transmit farther through tissue. This is a relative trend, not a guarantee that a particular wavelength reaches a joint surface, ligament, bone, or other target at a therapeutically relevant dose.

There is no single “best red light therapy wavelength for muscles.” A valid comparison should consider the complete optical exposure: spectrum, irradiance distribution, treatment distance, duration, tissue geometry, and the parameters used in the relevant human study. Independent or otherwise traceable spectral verification is more informative than a wavelength number printed on a specification sheet.

What rehabilitation clinics should look for in a compliant device

Comparison of Consumer-Grade LED Panels and Medical-Grade PBMT Panels

Common belief: If a device produces visible red and near-infrared light and lists wavelengths on the box, it is suitable for rehabilitation use.

What's more accurate: Optical output is only one part of suitability. Intended use, market-specific classification, electrical and photobiological safety, software functions, labeling, quality-system controls, and product-specific performance evidence must be considered together.

“Medical-grade” is not a universal regulatory classification. Buyers should ask what exact market authorization, product classification, standard, certificate, or test report supports the claim—and whether it covers the exact model and intended use being purchased.

How regulatory classifications reflect intended use
Common belief: FDA registration means a device is approved for therapeutic claims.

What's actually true: FDA establishment registration and device listing are administrative regulatory requirements for applicable establishments and devices. Registration and listing do not mean that the FDA has approved, cleared, authorized, certified, or endorsed the establishment or its products. A product's US marketing status must be supported separately by the applicable 510(k), De Novo, PMA, exemption, or other legal basis. The FDA explains this distinction directly in its registration and listing guidance.

Where establishment registration applies, it remains an important part of regulatory traceability, but it should be described accurately as FDA establishment registration rather than “FDA certification” or “FDA approval.”

Health Canada maintains a public database of active licences for Class II, III, and IV medical devices. REDDOT reports Health Canada Medical Device Licence No. 113779 for specified products. Before using this number as evidence for a particular purchase or claim, verify the current licence status, legal manufacturer, exact models or device family, and authorized intended use in the Medical Devices Active Licence Listing. A licence for one device family does not automatically cover every product sold by the manufacturer.

Australia's public ARTG entry 515205 identifies a “Red/infrared light phototherapy unit” as a Class IIa medical device, with Kingsmead Pty Ltd as sponsor and E.shine Systems Limited as manufacturer, dated 10 October 2025. This confirms an active ARTG inclusion for the stated kind of device. The exact model scope and intended purpose should still be checked against the supporting documentation before the entry is attributed to a specific REDDOT model or used to support a condition-specific claim. See the TGA public record.

Health Canada Class II and Australian Class IIa are classifications within different regulatory systems. They should not be described as identical classifications, and neither authorization proves every clinical statement that might appear in general marketing content.

The regulatory status of a device follows its intended use and claims—not simply whether it is sold to a consumer or a clinic. A wellness product, cosmetic device, and medical device may have different regulatory pathways even when the hardware appears similar.

Why manufacturing standards matter
ISO 13485:2016 specifies quality-management-system requirements for organizations involved in the life cycle of medical devices. Certification can provide evidence of documented design controls, production controls, traceability, complaint handling, corrective action, and other regulated processes within the certificate's scope. It does not independently verify the irradiance, wavelength, clinical efficacy, or performance of every product made at the facility.

REDDOT reports ISO 13485:2016 certificate No. 0220406 and MDSAP certificate No. 0220404, issued 28 July 2025. These should be described as quality-system certification and a successful MDSAP audit/certificate, not as product-level performance certification or “MDSAP registration.” Certificate validity, audited sites, product scope, and issuing organization should be confirmed from the actual documents.

The Medical Device Single Audit Program allows a recognized auditing organization to conduct one regulatory audit covering relevant requirements of participating authorities. The audit supports regulatory oversight of the manufacturer's quality system; it does not establish that a particular wavelength or exposure protocol is clinically effective.

Where applicable, IEC 60601-1, IEC 60601-2-57:2023, IEC 62471, and relevant collateral standards may address different parts of product safety and essential performance. ISO 13485 addresses the quality system. These documents complement one another but should not be combined into a general claim that a device is clinically proven.

Common pitfalls in rehabilitation PBMT protocols

Rehabilitation PBMT

Q: What are the most common technical mistakes when applying or evaluating PBMT?

The first is using irradiance measured at the device surface as though it were the irradiance at the treatment plane. The second is relying on a center-point peak without mapping output across the treatment area. The third is failing to record distance, angle, operating mode, channel ratio, pulse settings, warm-up time, and exposure duration.

Distance can change the delivered irradiance, but the change is not always described by a simple inverse-square relationship. Large LED arrays often operate in the optical near field at typical panel distances, and beam overlap can produce a complex spatial pattern. Measure the actual device at the actual distance rather than estimating from lens angle alone.

A fourth mistake is transferring a published protocol to a device with different optics, spectrum, source type, spot size, or output distribution. For example, WALT's 780–860 nm and 904 nm tables were developed for defined Class 3B laser configurations and use energy per treatment point. They are useful references within their scope but are not universal instructions for full-body LED panels.

A fifth mistake is presenting surface radiant exposure as the dose delivered to a deep target. Surface measurement is reproducible and useful for device verification, but tissue absorption and scattering prevent a simple one-to-one conversion to internal dose.

Clinical use should follow the device's authorized labeling, institutional procedures, and professional judgment. Conditions such as known malignancy, pregnancy, photosensitive disease, photosensitizing medication use, eye exposure risk, and implanted electronic devices require product-specific assessment rather than a universal contraindication list. PBMT is used under medical supervision in some oncology-support settings, while unsupervised exposure over a known tumor site may be inappropriate. For implanted devices, consult the PBMT device instructions, the implant manufacturer's guidance, and the responsible clinician.

Q: What are the practical downsides and safety considerations?

Adverse events reported in PBMT research are often mild and transient, but the risk depends on the product, wavelength, irradiance, exposure geometry, duration, population, and intended use. Possible concerns include temporary redness, discomfort from device warming, and ocular exposure. Eye-protection requirements should follow the product's photobiological risk assessment and instructions for use rather than a generic rule.

An inaccurate or unstable device can create several problems. Under-delivery may reduce the likelihood of reproducing a studied exposure and can delay appropriate care if the user relies on an ineffective intervention. Excessive or nonuniform output may increase thermal or optical risk. Verification should therefore include spectrum, irradiance mapping, output stability, surface temperature, electrical safety, and photobiological safety for the exact configuration.

WALT recommendations are professional guidance for specified source types and applications, not a universal regulatory standard. If a clinic uses a protocol that differs from a published study or professional recommendation, the clinical rationale, device parameters, and patient response should be documented by the responsible professional.

Key Takeaways
Rehabilitation light therapy is one application of photobiomodulation. It commonly uses red and near-infrared light to produce non-thermal photochemical and signaling effects, although device and tissue warming can still occur. Cytochrome c oxidase is one proposed photoacceptor, but the mechanism is broader and remains under investigation.

Evidence is condition- and outcome-specific. PBMT may be a useful adjunct for selected applications, but it should not be presented as a universal recovery treatment. Wavelength, irradiance, treatment distance, spectrum, uniformity, thermal stability, and radiant exposure must be reported together. A calculated surface exposure is not the same as a known dose at a deep anatomical target.

Regulatory records and quality-system certifications also have distinct meanings. ISO 13485 and MDSAP concern the manufacturer's quality system; and market licences or ARTG inclusion apply only within their documented scope.

FAQ
What is the downside of red light therapy?
The main limitation is that results depend on the condition, device, optical parameters, and consistency of use. An exposure that differs substantially from the parameters used in a relevant study may not reproduce the same outcome. More light is not automatically better because PBM responses can be biphasic and excessive exposure may add heat or discomfort without improving benefit.

Possible adverse effects are generally reported as mild in many studies, but safety cannot be assumed from wavelength alone. Users should follow the product's instructions concerning distance, session duration, eye protection, skin condition, medication-related photosensitivity, and other warnings. Medical rehabilitation applications should be supervised by an appropriately qualified professional.

What are the five main types of light therapy?
There is no universally accepted classification containing exactly five types. Common light-based categories include photobiomodulation using red or near-infrared light; bright-light therapy for circadian applications; UV phototherapy for defined dermatological conditions; blue-light or photodynamic approaches for selected skin applications; and infrared heating devices. These categories have different mechanisms, risks, and regulatory requirements, so their parameters are not interchangeable.

Can red light therapy be used to treat bursitis?
Evidence specific to bursitis is insufficient to make a broad treatment claim or recommend a universal distance, duration, or dose. The frequently cited Chow et al. review was published in The Lancet in 2009 and evaluated low-level laser therapy for neck pain—not bursitis—and therefore should not be used as direct evidence for bursitis treatment (DOI: 10.1016/S0140-6736(09)61522-1).

Bursitis may be mechanical, infectious, traumatic, or related to an inflammatory disease. Those causes require different management. PBMT should be considered only as a clinician-directed adjunct when appropriate, not as a substitute for diagnosing the underlying cause.

Can red light therapy heal torn ligaments?
PBMT cannot reconnect a completely ruptured ligament and should not be described as a replacement for surgical or rehabilitation management. Preclinical research has explored collagen organization and tendon repair, but animal tendon findings cannot be assumed to demonstrate healing of human ligament tears.

The Oliveira et al. study often cited in this context used 830 nm low-level laser therapy in a partial calcaneal/Achilles tendon injury model in rats. It was published in Lasers in Surgery and Medicine in 2009, not Photomedicine and Laser Surgery, and it did not study human ligaments (DOI: 10.1002/lsm.20760). It supports further research, not a human ligament-healing claim.

For a suspected partial or complete ligament tear, diagnosis and treatment planning should be performed by a qualified healthcare professional. Any PBMT use should follow the exact device labeling and an evidence-based rehabilitation plan.

Related Guides

Rehabilitation light therapy related guides and resource overview

The sections above cover the core scientific and engineering concepts behind rehabilitation PBMT. The following topics can extend that evaluation without turning general educational content into treatment instructions:


Transparency and Trust: Accessing Our Certifications and Test Reports
Red Light vs Near-Infrared Dose: Why Multi-Wavelength Panels Need Band-Split Joules
What Is The Irradiance Of Light?
Why Is Red Light Therapy Good for Seniors: 4 Key Benefits
What Is the Formula for Temperature Drift in a Red Light Therapy Panel and How to Apply It to Your Dose

The question "does red light therapy really help with recovery?" does not have a single device-independent answer. The most defensible assessment considers the condition-specific human evidence, certainty of that evidence, exact optical parameters, product quality, authorized labeling, and the role of PBMT within a broader rehabilitation plan.

References

Son Y, et al. “Effects of Photobiomodulation on Multiple Health Outcomes: An Umbrella Review of Randomized Clinical Trials.” Systematic Reviews, 2025. PubMed
Hamblin MR. “Mechanisms and Mitochondrial Redox Signaling in Photobiomodulation.” Photochemistry and Photobiology, 2018. DOI: 10.1111/php.12864
Anders JJ, Lanzafame RJ, Arany PR. “Low-Level Light/Laser Therapy Versus Photobiomodulation Therapy.” Photomedicine and Laser Surgery, 2015. DOI: 10.1089/pho.2015.9848
Chow RT, et al. “Efficacy of Low-Level Laser Therapy in the Management of Neck Pain.” The Lancet, 2009. DOI: 10.1016/S0140-6736(09)61522-1
Oliveira FS, et al. “Effect of Low Level Laser Therapy (830 nm) with Different Therapy Regimes on the Process of Tissue Repair in Partial Lesion Calcaneous Tendon.” Lasers in Surgery and Medicine, 2009. DOI: 10.1002/lsm.20760
World Association for Photobiomodulation Therapy. WALT Recommendations
U.S. Food and Drug Administration. Important Reminders About Registration and Listing
International Electrotechnical Commission. IEC 60601-2-57:2023
International Electrotechnical Commission. IEC 62471:2006
International Organization for Standardization. ISO 13485:2016
Health Canada. Medical Devices Active Licence Listing
Therapeutic Goods Administration. ARTG 515205

Confused by the rainbow of options in light therapy devices? Seeing claims for every color under the sun treating everything imaginable? It's easy to get lost in the hype, so let's shed some light on the science.
Different colors in LED light therapy correspond to different wavelengths of light. These wavelengths penetrate the skin to varying depths, interact with specific cellular components (chromophores), and trigger distinct biological responses, from boosting collagen (red) to fighting acne bacteria (blue).


Wavelength determines how deep light goes and what it affects.



The world of light therapy is buzzing, but not all colors are created equal when it comes to proven effects. As someone who's navigated this industry for 15 years with REDDOT LED, I've seen firsthand how important it is to separate marketing gloss from actual science. Let's break down what the evidence really says about each color.

What do different colors of light therapy do?
Overwhelmed by masks promising miracles with multiple colors? Wondering which color addresses your specific concerns? Let's cut through the noise and look at the functions tied to specific wavelengths.
Key light therapy colors have distinct primary functions: Red light (~630-660nm) focuses on skin rejuvenation and reducing inflammation; Blue light (~415-465nm) targets acne bacteria; Near-Infrared light (~810-850nm, invisible) penetrates deepest for pain relief and tissue repair.





Specific colors target distinct skin and tissue concerns.



Diving Deeper: Wavelengths, Penetration, and Targets
The effectiveness of light therapy hinges on physics and biology, not just color preference. Here's the breakdown:


The Wavelength-Depth Link: Shorter wavelengths (like blue) penetrate less deeply, primarily affecting the epidermis (top skin layer). Longer wavelengths (like red and especially near-infrared) travel further, reaching the dermis and even subcutaneous tissue.




Color
Typical Wavelength Range
Penetration Depth
Primary Targets




Blue
~415-465 nm
Shallow (Epidermis)
P. acnes bacteria


Green
~520-550 nm
Epidermis/Dermis
Melanocytes (pigmentation)


Yellow
~570-590 nm
Epidermis/Dermis
Superficial blood vessels


Red
~630-660 nm
Dermis
Fibroblasts, Mitochondria


Near-IR
~810-850 nm
Deep Dermis, SubQ
Mitochondria, Nerve cells, etc.




Cellular Interaction: Specific molecules within our cells, called chromophores1, absorb specific wavelengths.
Red/Near-Infrared: Primarily absorbed by cytochrome c oxidase in the mitochondria2, boosting cellular energy (ATP)3 production. This enhances cell function, repair, and regeneration. It also modulates inflammation4 and improves circulation5.
Blue: Absorbed by porphyrins produced by Propionibacterium acnes bacteria. This absorption creates reactive oxygen species that kill the bacteria – hence its use for acne6.
Green/Yellow: Evidence is less robust. Green light is proposed to target melanocytes, potentially helping with hyperpigmentation. Yellow light might affect superficial blood vessels and reduce redness. More research is needed here compared to red and blue light.

At REDDOT LED, our focus is on providing devices with well-researched wavelengths (like specific reds, near-infrared, and blues) and the ability to customize combinations based on therapeutic goals, ensuring you get light that actually does something meaningful.

What do different colors of lights do?
Still feeling a bit fuzzy on how just looking at a color translates to real effects? Is it just about the color itself, or is there more going on beneath the surface? Let's clarify the mechanism.
Different light colors (wavelengths) work by being absorbed by specific molecules in your skin and underlying tissues. This absorption triggers specific biological processes, like kick-starting cellular energy production or neutralizing bacteria, rather than working through psychological color association.


Light energy absorption by cells triggers biological effects.



Diving Deeper: It's Photochemistry, Not Just Color Psychology
The term "color therapy" can sometimes be misleading. While colors can have psychological effects, LED light therapy (more accurately termed photobiomodulation or PBM) operates on a physiological level.


Targeted Absorption: As mentioned, the key is that specific wavelengths are absorbed by specific cellular components (chromophores). Think of it like a lock and key – the right wavelength (key) fits into the right chromophore (lock) to initiate an action.

Mitochondria: For red and near-infrared light, the primary target is cytochrome c oxidase within the mitochondria. Boosting its activity enhances the entire cell's energy production (ATP). More energy means cells can repair damage, produce proteins like collagen7, reduce oxidative stress, and function more efficiently. This underpins benefits like skin rejuvenation and wound healing8.
Bacterial Porphyrins: Blue light specifically targets porphyrins naturally produced by the common acne bacteria, P. acnes. Absorbing blue light makes these porphyrins toxic to the bacteria itself, leading to bacterial death and reduced acne breakouts.


Beyond Absorption – Signaling Cascades: The initial absorption event triggers downstream effects. For instance, increased ATP can lead to reduced inflammation markers, improved blood flow through nitric oxide release, and activation of signaling pathways that promote healing and reduce pain. It's a biological cascade initiated by light.
Distinguishing from Chromotherapy: Traditional chromotherapy often associates colors with moods or 'energies' (e.g., blue for calm, yellow for joy). While LED therapy might indirectly improve mood by reducing pain or improving skin appearance, its primary mechanism is photochemical and photophysical, not psychological association based purely on color perception. Be critical of devices mixing PBM claims with vague ‘energy balancing' via colors with less scientific backing.
As a manufacturer (REDDOT LED), we ensure our devices deliver specific, calibrated wavelengths known to interact effectively with these biological targets.

What are the benefits of 7 color LED light therapy?
Seen those popular masks cycling through red, blue, green, yellow, purple, cyan, and white? Tempted by the idea that more colors must mean more benefits? Let's critically evaluate the "7-color" approach.
While 7-color LED devices offer versatility, the primary scientifically backed benefits come from red, blue, and near-infrared light. Other colors (green, yellow, cyan, and purple) have less robust evidence for specific therapeutic claims. Effectiveness also depends heavily on the power output for each color.
Multi-color devices offer variety, but evidence varies by color.

Diving Deeper: Assessing the Rainbow – Hype vs. Reality
The appeal of an all-in-one device is understandable, but it's crucial to look past the marketing.


The "Core" Colors:

Red (~630-660nm): Strong evidence for stimulating collagen, reducing wrinkles, improving skin texture, reducing inflammation, and aiding healing.
Blue (~415-465nm): Proven efficacy against P. acnes bacteria for treating mild to moderate acne.
Near-Infrared (~810-850nm): (Often included, though invisible) Excellent for deep tissue repair, pain relief, reducing inflammation, and enhancing recovery.


The "Supporting Cast" – Less Evidence:

Green (~520-550nm): Claimed to target melanocytes, potentially helping with hyperpigmentation (age spots, sun spots). Some preliminary studies exist, but more high-quality human trials are needed.
Yellow (~570-590 nm): Claimed to reduce redness, improve lymphatic flow, and soothe sensitive skin. Evidence is largely anecdotal or based on studies with combined lights.
Purple (often Blue + Red): Claims combine the benefits of blue (acne) and red (healing). Effectiveness depends on whether both wavelengths are emitted effectively simultaneously or sequentially.
Cyan (Blue + Green): Claims soothe irritated skin and reduce swollen capillaries. Limited specific evidence.


The Power Problem: A major issue with many consumer-grade 7-color devices is power density (irradiance). To be effective, each wavelength needs to be delivered at a sufficient intensity. Devices splitting power across many colors might deliver insufficient energy for any color to produce significant biological effects. It's often better to have a device delivering adequate power in one or two well-proven wavelengths than low power in seven.
Targeted vs. Shotgun: While versatility seems appealing, a targeted approach using specific, proven wavelengths for your particular goals (like robust red/NIR for anti-aging or powerful blue for acne) is often more effective. That's why at REDDOT LED, while we can create multi-wavelength devices via OEM/ODM, we emphasize matching the right, potent wavelengths to the client's specific therapeutic application.

What do different colors mean in color therapy?
Hearing "color therapy" used interchangeably with LED light therapy? Wondering if the calming effect of blue light is the same reason hospitals use blue tones? Let's differentiate these concepts clearly.
In LED light therapy (photobiomodulation), colors represent specific wavelengths with distinct physiological effects based on cellular absorption. In traditional "color therapy" (chromotherapy), colors often carry symbolic meanings associated with emotions, chakras, or energies, lacking the same level of scientific validation for physiological change.
LED therapy is science-based; traditional color therapy is often symbolic.

Diving Deeper: Photobiomodulation vs. Chromotherapy
It's easy to conflate these terms, but their foundations are quite different. Understanding this distinction is key to evaluating claims critically.


LED Light Therapy (Photobiomodulation – PBM):

Mechanism: Based on photochemistry and photophysics. Specific wavelengths of light are absorbed by cellular chromophores (e.g., mitochondria), triggering measurable biological responses (e.g., increased ATP, reduced inflammation, bacterial death).
Focus: Physiological outcomes – skin repair, pain reduction, acne clearance, and improved circulation.
Evidence: Supported by numerous peer-reviewed scientific studies and clinical trials for specific wavelengths (especially red, near-infrared, and blue).
Example: Using a 660nm red light panel to stimulate fibroblast activity for collagen production.


Traditional Color Therapy (Chromotherapy):

Mechanism: Often based on psychological association, symbolism, or energy concepts (like chakras). Proposes that exposure to certain colors (through light, environment, or visualization) can influence mood, emotions, or subtle body energies.
Focus: Primarily psychological, emotional, or spiritual well-being.
Evidence: Largely anecdotal or based on subjective experience. Lacks robust scientific validation for causing direct, consistent physiological changes in the way PBM does. Some psychological effects of color are studied (e.g., blue light's effect on alertness via melanopsin, environmental color psychology), but this is different from claiming green light physically heals a specific organ via ‘vibrational energy'.
Example: Using a blue-colored room to promote calmness or associating green with healing and balance.



While PBM might lead to improved mood as a secondary effect of feeling better or looking better, its primary mode of action is distinct from the proposed mechanisms of traditional chromotherapy. As an industry veteran, I believe it's crucial to stick to the science. REDDOT LED focuses strictly on photobiomodulation, developing devices based on wavelengths with demonstrable physiological effects, backed by research and rigorous testing in our own lab.

Conclusion
Different colors in LED therapy mean different wavelengths targeting distinct depths and cellular components for specific results – Red/NIR for repair and energy and blue for acne. While multi-color devices exist, effectiveness depends on proven wavelengths and sufficient power, not just variety.



References




Health Effects of Artificial Light 2021.9.15



Mitochondria, Cell Energy, ATP Synthase, National Human Genome Research Institute.



Adenosine triphosphate 2024.10



Inflammation, Cleveland Clinic, reviewed Aug 2021.



The Heart 2022.3.24



Phototherapy with blue (415 nm) and red (660 nm) light in the treatment of acne vulgaris, British Journal of Dermatology, May 2000.



What is collagen, and why do people use it?, Medical News Today, updated Jan 2020.



Mechanisms and applications of the anti-inflammatory effects of photobiomodulation, AIMS Biophysics, May 2017.

Heard about blue light therapy but not quite sure what it is? It's different from the light emitted by your phone, and it has specific therapeutic applications.

Blue light therapy is a non-invasive treatment that uses specific wavelengths of blue light to treat certain skin conditions, primarily acne.1 It works by killing Cutibacterium acnes (formerly Propionibacterium acnes), the bacteria responsible for causing acne breakouts.


Blue light therapy is commonly used for acne treatment.

While REDDOT LED specializes in red light therapy devices, it's important to understand the differences and applications of blue light. Let's dive in.

What is blue light therapy used for?
Curious about the range of conditions treated with blue light? While acne is the primary application, blue light therapy is also used for other purposes.

Blue light therapy is primarily used to treat acne vulgaris (common acne). It can also be used for:
* Wound Healing: Blue light can promote wound healing by reducing inflammation and killing bacteria.
* Eczema and Psoriasis: In some cases, blue light therapy may help to reduce inflammation and itching associated with these skin conditions.
* Sun Damage: Blue light may help to improve the appearance of sun-damaged skin by reducing inflammation and promoting collagen production.


Before and after blue light treatments for acne.

The key to blue light therapy's effectiveness lies in its ability to target specific molecules within bacteria and skin cells.

How Blue Light Therapy Works:

Absorption by Porphyrins: C. acnes bacteria produce porphyrins, light-sensitive compounds.
Destruction of Bacteria: When exposed to blue light, these porphyrins absorb the light and produce free radicals, which kill the bacteria.
Reduced Inflammation: Blue light can also help to reduce inflammation in the skin, further improving acne symptoms.
Potential for Other Conditions: While less common, blue light's antimicrobial and anti-inflammatory properties make it potentially useful for wound healing and certain inflammatory skin conditions.
It's important to note that blue light therapy is not a cure for acne or other skin conditions. It's a treatment that can help to manage symptoms and improve the appearance of the skin.

What is the difference between blue and red light therapy?
Confused about the contrasting effects of blue and red light? They're both used in light therapy, but they work in very different ways.

The key difference between blue and red light therapy lies in their wavelengths and how they interact with the skin.2 Blue light targets bacteria on the surface of the skin, while red light penetrates deeper to stimulate collagen production and reduce inflammation.


Blue light targets surface bacteria; red light penetrates deeper.

Here's a more detailed comparison:




Feature
Blue Light Therapy
Red Light Therapy




Wavelength
400-495 nm
620-700 nm


Primary Target
Cutibacterium acnes bacteria
Mitochondria in skin cells


Mechanism
Kills bacteria by exciting porphyrins
Stimulates collagen production, reduces inflammation


Common Uses
Acne treatment
Skin rejuvenation, pain relief, wound healing


Penetration
Superficial (primarily affects the epidermis)
Deeper (affects the dermis and underlying tissues)


Potential Risks
May cause temporary dryness or redness
Generally considered safe with minimal side effects



As REDDOT LED focuses on red light therapy devices, we prioritize solutions for skin rejuvenation, pain relief, and overall wellness. Our customizable devices, backed by certifications like MDSAP/FDA/CE, are designed to deliver targeted red and near-infrared light for optimal therapeutic benefits.

What are the benefits of blue light?
Interested in the specific advantages of blue light exposure? Beyond acne treatment, blue light offers other potential benefits.

The primary benefit of blue light therapy is its effectiveness in treating acne by killing acne-causing bacteria.1 Additional benefits may include wound healing, eczema and psoriasis relief, and sun damage treatment.

It's important to note that research on some of these benefits is still ongoing, and blue light therapy may not be suitable for everyone.

Potential Benefits of Blue Light Therapy:

Acne Treatment: The most well-established benefit. Blue light effectively targets and kills C. acnes bacteria, reducing breakouts and inflammation.
Wound Healing: Blue light's antimicrobial properties can help to prevent infection and promote faster wound healing.
Eczema and Psoriasis Relief: Blue light may help to reduce inflammation and itching associated with these skin conditions, but more research is needed.
Sun Damage Treatment: Blue light may improve the appearance of sun-damaged skin by reducing inflammation and promoting collagen production, but red light is generally considered more effective for this purpose.
Mood Enhancement: Some studies suggest that exposure to blue light can improve mood and alertness, particularly in people with seasonal affective disorder (SAD).
While blue light therapy offers these potential benefits, it's crucial to consult with a dermatologist or healthcare professional to determine if it's the right treatment for your specific condition and skin type.

What are the benefits of blue light machine?
Considering investing in a blue light therapy machine? Understanding the potential advantages can help you make an informed decision.

The main benefit of a blue light machine is the ability to conveniently treat acne at home.1 It also provides wound healing, eczema and psoriasis relief, and sun damage treatment. It offers a non-invasive, drug-free alternative for managing various skin conditions.


Blue light machines provide convenient at-home treatment.

Compared to in-office treatments, a blue light machine offers greater convenience and potentially lower long-term costs.

Advantages of Using a Blue Light Machine:

Convenience: Treat your skin in the comfort of your own home, without the need for frequent visits to a dermatologist or aesthetician.
Cost-Effectiveness: While the initial cost of a blue light machine may be higher than a single in-office treatment, it can be more cost-effective in the long run if you require ongoing treatment.
Non-Invasive: Blue light therapy is a non-invasive treatment that doesn't involve any needles, surgery, or downtime.
Drug-Free: It's a drug-free alternative for managing acne and other skin conditions, which can be appealing to people who want to avoid the potential side effects of medications.
Targeted Treatment: Blue light machines allow you to target specific areas of your skin that are affected by acne or other conditions.
Before investing in a blue light machine, research different models, read reviews, and consult with a dermatologist to ensure it's the right choice for your needs. While REDDOT LED specializes in red light therapy, understanding the benefits of other light therapies helps us provide comprehensive information to our partners and customers.

Conclusion
Blue light therapy primarily treats acne by killing bacteria.1 It may also aid wound healing, eczema, and sun damage. It differs from red light, which boosts collagen and reduces inflammation.2 Blue light machines offer convenient at-home treatment.

References




The benefits and side effects of blue light treatment for acne 2021.8.6 ↩ ↩ ↩ ↩ ↩



How are Red and Blue Light Therapy Devices Different? 2020.7.17 ↩ ↩