Not all LED light therapy panels are created equal. While many devices on the market boast high power or numerous wavelengths, their true therapeutic effectiveness is determined by a much more nuanced interplay of factors. Understanding the science behind LED panel optics and wavelengths is the single most important step in selecting a device that delivers consistent, predictable, and safe results for your clients or patients. This guide demystifies the core engineering principles that separate a consumer gadget from a professional-grade therapeutic instrument.