| Definition: | quotient of the upward luminous flux of a luminaire, measured under specified 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 practical conditions Note 1 to entry: The upward light output ratio has unit one. Note 2 to entry: This note applies to the French language only.
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