luminous flux unit

English Thesaurus

1. a measure of luminous flux per unit area (noun.quantity)

hypernym	:	light unit,
definition	:	a measure of the visible electromagnetic radiation (noun.quantity)

hyponym	:	lm, lumen,
definition	:	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 (noun.quantity)