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The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.

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17-29-052

light output ratio, <of a luminaire>

LOR

luminaire efficiency

RLO

quotient of the total luminous flux of the luminaire, measured under specified practical conditions with its own lamp(s) and equipment, and the sum of the individual luminous fluxes of the same lamp(s) when operated outside the luminaire with the same equipment, under specified conditions

Note 1 to entry: For luminaires using incandescent lamps only, the optical light output ratio and the light output ratio are the same in practice.

Note 2 to entry: The light output ratio has unit one.

Note 3 to entry: This entry was numbered 845-09-39 in IEC 60050-845:1987.

Note 4 to entry: This entry was numbered 17-668, 17-696, and 17-708 in CIE S 017:2011.

Publication date: 2020-12
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