luminous flux unit

Noun
  1. A measure of luminous flux per unit area (synset 113661406)
    is a type of: light unit - a measure of the visible electromagnetic radiation
    subtypes: lm, lumen - 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

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