lumen (redirected from lumens)

lumen /lu·men/ (loo´men) pl. lu´mina   [L.]

1. the cavity or channel within a tube or tubular organ.

2. the SI unit of luminous flux; it is the light emitted in a unit solid angle by a uniform point source with luminous intensity of one candela.lu´minal

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residual lumen  the remains of Rathke's pouch, between the distal and intermediate parts of the pituitary gland.

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lu·men (lmn)

n. pl. lumens or lu·mi·na (-m-n)

1. The inner open space or cavity of a tubular organ, as of a blood vessel.

2. The unit of luminous flux in the International System of Units, equal to the amount of light given out through a solid angle by a source of one candela intensity radiating equally in all directions.

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lumen·al, lumin·al adj.

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Lumen

The inner cavity or canal of a tube-shaped organ, such as the bowel.

Mentioned in: Amebiasis

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lumen

[lo̅o̅′mən] pl. lumina, lumens

Etymology: L, light

1 a tubular space or the channel within any organ or structure of the body.

2 a unit of luminous flux that equals the flux emitted in a unit solid angle by a point source of one candle intensity. lumenal, luminal, adj.

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lumen (loo´mn),

n the space within a tube structure, such as a blood vessel, tube, or duct.

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lumen

pl. lumina [L.]

1. the cavity or channel within a tube or tubular organ, as a blood vessel or the intestine.

2. the SI unit of light flux.

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lumen

1. SI unit of luminous flux. It is equal to the flux emitted within a unit solid angle of one steradian by a point source with a luminous intensity of one candela. Symbol: lm. 2. The space in the interior of a tubular organ, such as an artery. See luminous flux; quantity of light; lux; SI unit.

Table L4 Approximate luminance (in cd/m2) of some objects
sun	109
car headlight	107
incandescent lamp (tungsten)	106-107
fluorescent lamp	104-105
clear sky at noon	104
cloudy sky at noon	103
shady street by day	103-104
full moon	103
book print under artificial light	>102
photopic vision	>10
street illumination	1-10−1
mesopic vision	10-10−3
cloudless night sky with full moon	10−2
scotopic vision	<10−3
moonless and cloudless night sky	10−3-10−6