- Abbreviated as "UV". The band of radiation that spans wavelengths from 100 to 400 nanometers (nm).
- The International Commission on Illumination (CIE) divides the UV band as follows:
UVA315-400 nmUVB280-315 nmUVC100-280 nm
- The UV Spectrum can be divided by practical application:
Ozone-producing180-220 nmGermicidal220-300 nmErythemal (skin reddening)280-320 nmBlack light320-400 nm