International Electrotechnical Commission
Glossary

EN light output ratio (of a luminaire); luminaire efficiency (USA)  
ratio of the total flux of the luminaire, measured under specified practical conditions with its own lamps and equipment, to the sum of the individual luminous fluxes of the same lamps when operated outside the luminaire with the same equipment, under specified conditions

[SOURCE: IEC60050-845:1987, 845-09-39]


TC/SC:82Terms     Info     Publications
Published in:IEC 62257-1, ed. 3.0 (2015-10) Terms     Info
Reference number:A.66

Copyright 2021 IEC, Geneva, Switzerland. All rights reserved