Light therapy uses specific wavelengths of light applied to the body to improve health. Red light therapy, also called Low-Level Laser Therapy (LLLT) or photobiomodulation, uses red and invisible near-infrared light to achieve a biological effect.
The light spectrum includes infrared (felt as heat), visible light (all rainbow colors), and ultraviolet (can cause sunburn). Red light therapy specifically uses 600–700nm red light plus invisible near-infrared light out to ~1200nm.
