Lumen
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The SI unit of luminous flux. It is the luminous flux emitted within unit solid angle (one steradian) by a point source having a uniform luminous intensity of one candela. Definition adopted by the 9th General Conference on Weights and Measures (1948).
Symbol: lm
Reference: C.I.E.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
