LED stands for Light Emitting Diode, which is a tiny computer chip encased in glass. Each LED wavelength (color) of light provides unique therapeutic benefits. LED is non invasive, painless and requires no recovery time. This light is good for all skin types and is engineered to emit a soothing gentle warmth. Clinically proven results originally used by Nasa for wound healing, FDA cleared, it is a natural way to ease pain and reduce inflammation while accelerating your body 's healing process. A perfect solution for after surgery trauma. Great after strong peels. Take yours home!