1. a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions; [syn: lumen, lm]
WordNet (r) 3.0 (2006):
lm
n 1: a unit of luminous flux equal to the amount of light given
out through a solid angle of 1 steradian by a point source
of 1 candela intensity radiating uniformly in all
directions [syn: lumen, lm]