Ultraviolet light (UV) is a form of electronic radiation having shorter wavelengths than with visible regions. UV Ultraviolet light is not in the visible spectrum. What this means is that human beings can not actually "see" true UV light just as we cannot hear high pitches sounds that our pet dog may well hear. UV light come with three types of ultraviolet wavelengths, such as long wave (UV-A), medium wave (UV-B), and short wave (UV-C).