# 17-21-087

ηe; η

quotient of the radiant flux of the emitted radiation and the power consumed by the source

Note 1 to entry: It is necessary to specify whether the power dissipated by auxiliary equipment (such as ballasts), if any, is included in the power consumed by the source.

Note 2 to entry: The radiant efficiency has unit one.

Note 3 to entry: This entry was numbered 845-01-54 in IEC 60050-845:1987.

Note 4 to entry: This entry was numbered 17-1018 in CIE S 017:2011.

Publication date: 2020-12