【Proven wavelengths】 Different wavelengths of light are measured in nanometers (nm). Wavelengths in the mid 600 and mid 800 nm range have been found to be particularly beneficial to the human body. The Onerbl Red Light Therapy Panel emits two specific wavelengths, 660nm (Red) and 850nm (NIR) in equal proportions to deliver the perfect combination of light therapy. Red light is best for skin treatments, while NIR is best for deep tissue treatments.