Red light therapy bringing with it everything your body uses to fix troubled areas and muscles, speeding up recovery time. How is red light therapy works? 2 wavelengths of light work together to protect your body. Visible light(660nm wavelength) stimulates the surface layers of your body, accelerating the enhancement and regeneration of surface tissues.Invisible light(850nm wavelength) protects the deep layers of your body and promotes deep tissue recovery. Benefits of Red light therapy.