| NOUN | quantity | luminous flux unit | a measure of luminous flux per unit area |
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| Meaning | A measure of luminous flux per unit area. | |
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| Narrower | lumen, lm | 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 |
| Broader | light unit | A measure of the visible electromagnetic radiation |
| Catalan | unitat de flux lluminós | |
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