Ultraviolet light. A type of electromagnetic radiation that covers the wavelength range 100-400 nm, which is a higher frequency and lower wavelength than visible light. Ultraviolet light is divided into three bands: UVA (315-400 nm), UVB (280-315 nm), and UVC (100-280 nm). In humans, increased exposure, particularly to high-frequency UVA, can damage living tissue and cause skin cancers, cataracts, and immune system damage.
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