IEVref:	845-01-51		ID:
Language:	en		Status: Obsolete
Term:	lumen
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Symbol:	lm
Definition:	SI unit of luminous flux: Luminous flux emitted in unit solid angle (steradian) by a uniform point source having a luminous intensity of 1 candela Equivalent definition. Luminous flux of a beam of monochromatic radiation whose frequency is 540 × 1012 hertz and whose radiant flux is 1/683 watt.
Publication date:	1987
Source	9th General Conference of Weights and Measures, 1948
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