ISO/CIE 23539:2005, Photometry - The CIE system of physical photometry

ISO 23539:2005 specifies the characteristics of the system of physical photometry established by the CIE and accepted as the basis for the measurement of light. It defines the photometric quantities, units and standards that make up the CIE system of physical photometry and that have been officially accepted by the Comit� International des Poids et Mesures (CIPM).