Infrared light therapy uses infrared light, an electromagnetic radiation that has a wavelength just greater than that of the red end of the visible light spectrum, but less than that of microwaves. Infrared radiation has a wavelength from about 800 nm to 1 mm, and is emitted particularly by heated objects. Infrared light therapy can involve lights or objects heated by infrared lights, which are placed directly on or over the skin. Energy from the lights penetrates beneath the skin and is absorbed by deep tissues.

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