definition of the word lumen

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Lumen

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lumen (plural lumens or lumina)

1. (physics) In the International System of Units, the derived unit of luminous flux; the amount of light that falls on a unit area at unit distance from a source of one candela. Symbol: lm.
2. (anatomy) The cavity or channel within a tube or tubular organ.
3. (botany) The cavity bounded by a plant cell wall.
4. The bore of a tube such as a hollow needle or catheter.

Definition from Wiktionary Content avaible with GNU Free Documentation License

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