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What is Red Light Therapy Irradiance?

Frequently Asked Question

Understanding Irradiance In Red Light Therapy: For Optimal Photobiomodulation

Does more irradiance mean better in red light therapy?

In most cases, increased irradiance in red light therapy is desirable because it enables deeper penetration into the cell. Then again a lower irradiance should perhaps be considered to less sensitive areas such as the eyes.

How much power should be used in efficient red light therapy?

Typical Red Light Therapy irradiance values for most applications are within 50-150mW/cm² including skin rejuvenation, wound healing, and pain management. An irradiance that exceeds 200 mw/cm² could be considered for deeper cellular penetration.

What is the most effective red light treatment at home?

Some of the most powerful certified panels in the world available include our RDPRO series. Visit the RDPRO1500 which can offer more than mW/cm² irradiance at a 6m distance.


When choosing the right red light therapy device for you, the three most important factors to consider are irradiance, wavelength, and EMF.So let’s dive into deciphering irradiance’s secret code!

Understanding Light Irradiance Importance

Irradiance means square centimeters and is short for mW/cm². It shows light’s spotlights of instantaneous exposures and intensities.

The level of irradiance refers to the amount of red light energy in some areas and indicates photons that can be taken up by each cell. There is no connection between such phenomena as the energy level of the light source and the light output at the moment of emission. An LED bulb’s wattage has nothing to do with the power it emits, while its power consumption depends completely on the energy flux per unit area irradiance. Many devices are power-hungry and produce little in the end largely because of substandard components. There is no correlation between watts and usable red light. Furthermore, an overheating red light device might dissipate more electrical power than it produces as red light.

Efficient red light panel has lower total power consumption, but higher average power density or irradiance. Irradiance is not a measure of true optical density and it reduces while one moves away from the light source. However, if only on the consideration of the wavelength and neglecting at the same time its power irradiance, it will be found that even low-power hardware devices cannot give sufficient treatment with red light. Higher power irradiance output leads to the absorption of stronger light that results in strong therapeutic effects in less time.

Does the Number of Bulbs Determine Irradiance Quality?

Does the Number of Bulbs Determine Irradiance Quality?

No. From the perspective of irradiance, the number of LED bulbs in the panel is not important, the key is their type, power level, and beam angle. Different numbers of LED bulbs (such as 50 low/moderate power or 25 high power) can provide the same or similar levels of treatment, as long as the focus is on close-range irradiation of small body parts. Wavelength and power density/irradiance are the key factors, not the number of LEDs. However, more light-bulb panels can cover a larger area. Therefore, panels designed to cover the entire fuselage or larger body parts need to be selected with a large number of light bulbs or LED panels, such as medical-grade full-body panels with 600 LEDs.

What Do You Need To Consider For Comparing Irradiance Levels?

Effective comparison requires assessing:

  • Peak Irradiance: Highest intensity in mW/cm² achievable to activate receptors.
  • Average Irradiance: Broader quantity in mW/cm² across the treatment area for adequate Irradiation.
  • Uniformity: How consistently irradiance distributes without hot/cold spots in %.
  • Dimensions: Treated surface areas in cm² matter for sufficient whole-body coverage.
  • Emission Data: Manufacturer reports on irradiance specifications and testing standards lend credibility to advertised performance.

Reputable devices cite irradiance levels substantiated by scientific metrics, not just intuitive output claims. Independent verification adds confidence in making informed choices.

What Do Need You To Know For Irradiance In Red Light Therapy?

  1. The higher the power density/irradiance, the better the quality of the device.
  2. Higher irradiance means less time spent in front of the light board.
  3. Most studies showing the benefits of red LEDs and near-infrared light therapy have used light power outputs ranging from 20 to 200 MW/CM2.
  4. For deeper cellular penetration, a power density/irradiance reading greater than 100 MW/CM2 is recommended.
  5. If deep cell penetration is not required, an irradiance level of 20 MW/CM2 but less than 100 MW/CM2 is appropriate.
  6. Self-adjusting irradiance levels can be achieved by moving closer to or away from the equipment.
  7. Having your instrument to measure irradiance might help.
  8. There is no optimal level of irradiance and only one level is best suited to individual needs.
  9. Individual treatment needs will determine the best choice.

What Are The Facilities For Measuring Red Light Irradiance?

Photometers precisely quantifying light levels empower verification:

  • Irradiance Sensors: Compact photon detectors in mW/cm2 for benchtop or surface measurements.
  • Laser Power Meter: Measures irradiance in mW over larger areas with built-in or removable sensor heads.
  • Light Meters: Compact photometers calibrating irradiance in different ranges for general light readings.
  • International Light Technologies Spectroradiometers: Gold standard laboratory-grade instruments characterizing emission spectra in photosynthetic photon flux density units.

Regular measurement establishes treatment reliability throughout the lifespan of a device. Proper handling ensures accurate long-term readings.

Additional Scientific Resources

The Best Red Light Therapy Body Panel For 2023

The following refers to studies of irradiance levels and their relationship to successful red light therapy for a variety of purposes:

A Preliminary Study of the Safety of Red Light Phototherapy of Tissues Harboring Cancer

Blue and red light combination LED phototherapy for acne vulgaris in patients with skin phototype IV

Low-level laser (light) therapy (LLLT) in skin: stimulating, healing, restoring.

How is Optical Power Represented in Red Light Therapy Devices?

Converting photons’ radiometric measurements to their biological impacts on living tissues requires considering optical power in joules. As irradiance denotes instantaneous potency, power relates light dose over time through the equation:

Power (mW or J/s) = Irradiance (mW/cm²) x Area (cm²)

Many devices list maximum optical power outputs instead of irradiance to simplify comparisons. For example, a 50-mW emitter concentrated over a 1-cm² diode achieves a 50-mW/cm² peak irradiance.

With treatment durations, power translates directly to cumulative light dose in joules useful for planning protocols. A 50-mW red light applied for 60 seconds over a 5-cm² area delivers a total energy dose of 15 Joules (50mW x 60sec = 3000mJ = 3 Joules x 5cm² area = 15 Joules).

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