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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: LuxFor other meanings, see Lux (disambiguation). The lux (symbol: lx is the SI derived unit of illuminance or illumination. It is equal to one lumen per square metre. sunlight on an average day ranges from 32 000 (32 klx) to 100 000 lux (100 klx) TV studios.

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Lumen GentiumOne of the principal documents of the Second Vatican Council, Lumen Gentium is the Dogmatic Constitution on the Church . The name means "light of the nations" in Latin and is from the first line of the document, as is customary with Catholic Church docume

LumenIn 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

Lumen (unit)For alternate uses of the term lumen, see lumen 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.

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