17-1380

upward light output ratio (of a luminaire)

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

Unit: 1

See also NOTE to "optical light output ratio"

Abbreviation: "ULOR"

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