Infrared light therapy is a form of light therapy, which involves getting exposed to sufficient intensity of infrared light to experience health benefits. The infrared spectrum is the invisible light with frequencies below that of the red light. It is why we feel gentle radiant heat when we are exposed to the sun because infrared creates heat in our tissues. However, the infrared spectrum also affects our physiology in other ways.
The infrared spectrum is between 700 nm to 0.1 mm in wavelength, which can be divided into near, mid, and far-infrared spectrum. The longer the wavelength, the lower the frequency and the further the light can penetrate tissues.
Different ranges of infrared frequency have different health benefits.