| quotient of the luminous flux emitted by a reference lamp when operated with a particular production ballast and the luminous flux emitted by the same reference lamp when operated with its reference ballast Note 1 to entry: The ballast lumen factor has unit one. Note 2 to entry: This entry was numbered 845-09-63 in IEC 60050-845:1987. Note 3 to entry: This note applies to the French language only.
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