Lumen

2-1-020

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)

English