Light is differentiated by wavelength. Wavelengths are measured in nanometers or 10 -9th meters.Shorter wavelengths like blue are generally in the mid to low 400’s. Acne for examp le might be best treated by a 417 nm blue light. Seasonal affective disorder may benefit from the sky blue 450 nm light shining on the receptors on the bottom inside of the eye. MRSA might be better killed by a 470nm blue. They are all blue, but the biological effects are different. Green, like blue can have similar biological benefits. At 528 – 540 nm’s green may for example may be an effective wavelength for diabetes and neuropathy as well as improve dermal circulation to affect hyper pigmentation. Green has been surprising researchers, and actually outperforming red in new studies on photobiomodulation [2-3].  Reds in the 630 – 660 nm wavelengths may prove effective for promoting ATP synthesis and increasing collagen production and elastin tightening. Manufacturers typically mix 633 red (skin) with 660 red (ATP). Near infrared energy in the 700 to 1000 nm range generally is not visible to the human eye and penetrates deeper into body. This deeper penetration may better affect joints, tissues and organs. Different wavelengths seem to have different healing signatures without producing negative side effects. While the biological benefits of Red and NIR are similar, we believe that there is a synergy in combining healing signatures. ARRC LED utilizes 9 extraordinarily powerful LEDs divided into 5 wavelengths to create the optimal mix of dose and healing signatures. Feedback from users since our introduction of the EDGE in 2016 suggests this to be the right path!