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Lumen

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In anatomy, the lumen is the cavity or channel within a tube or tubular structure, such as the vascular lumen of a blood vessel, along which blood flows.

In astronomy, 141 Lumen is the name of an asteroid discovered by the French astronomer Paul Henry in 1875.

In physics, specifically photometry (optics), the lumen (symbol: lm) is the SI derived unit of luminous flux. It is the amount of light that falls on a unit area at unit distance from a source of one candela.

See also: Lux.

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