? Ultraviolet light is an electromagnetic wave with a wavelength between 10nm and 400nm. It belongs to the invisible light other than the seven-color light (Red orange yellow green cyan blue purple) visible to the human eye. From the wave-particle duality of light, ultraviolet light is shorter than visible light because of its wavelength, Its penetration in the propagation process is very weak, but it causes photon energy to be greater than visible light, and it is easier to trigger a series of photochemical reactions and electronic transitions after irradiating substances. The application of ultraviolet rays is based on the above two characteristics.

Divided by band

? According to ISO-DIS-21348 and Chinese current national standard GB/T2900.65-004 “Electrical terminology lighting”, the most widely used ultraviolet bands are classified as: UVA (400nm-315nm), UVB (315nm-280nm), UVC ( 280nm–200nm).