| luminous flux emitted by the light source under operating conditions, within a cone having a vertically downward axis and enclosing the solid angle Note 1 to entry: The cumulative flux is expressed in lumen (lm). Note 2 to entry: In radiometry, the term "cumulative flux" is also used with respect to radiant flux instead of luminous flux and in that case is expressed in watt (W). Note 3 to entry: This entry was numbered 845-09-31 in IEC 60050-845:1987.
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