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Lumen
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lumen (l¡´men) noun
plural lumens or  lumina (-me-ne)
1.Anatomy. The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.
2.Abbr. lm Physics. The unit of luminous flux in the International System, equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions.
3.Botany. The cavity bounded by a plant cell wall.

[Latin, an opening, light.]
- lu´menal or  lu´minal adjective

luminous flux

luminous flux (l¡´me-nes flùks) noun
The rate of flow of light per unit of time, especially the flux of visible light expressed in lumens.

Lumen

Lumen, unit of luminous flux, the visible energy emitted into a given solid angle by a light source per unit time. One lumen equals the flux emitted in a unit solid angle, or steradian, by a point source with a uniform intensity of one candela. The total luminous flux of a light source divided by 4p equals the average candlepower of the source measured in all directions.

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