spectral luminous efficacy, <for a specified photometric condition>
product of spectral luminous efficiency and maximum luminous efficacy for a specified photometric condition
Note 1 to entry: The photometric condition should be specified (e.g. photopic, scotopic, mesopic). If it is not specified, photopic vision is assumed and the symbol
Note 2 to entry: Spectral luminous efficacy for photopic vision is expressed by
Note 3 to entry: The spectral luminous efficacy is expressed in lumen per watt (lm⋅W−1).