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utilization factor, <of an installation>
coefficient of utilization, <of an installation>
quotient of the luminous flux received by a reference surface and the sum of the rated individual luminous fluxes of the lamps of the installation
Note 1 to entry: The utilization factor has unit one.
Note 2 to entry: This entry was numbered 845-09-51 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-1383 and 17-183 in CIE S 017:2011.