lumen

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lumen

 [lu´men] (L.)
1. the cavity or channel within a tube or tubular organ, as a blood vessel or the intestine.
2. the SI unit of rate of flow of radiant energy, specifically that of the visible spectrum. adj., adj lu´minal.

lu·men

, pl.

lu·mi·na

,

lu·mens

(lū'men, -min-ă, -menz),
1. The space in the interior of a hollow tubular structure (for example, artery or intestine).
2. The unit of luminous flux; the luminous flux emitted in a unit solid angle of 1 steradian by a uniform point source of light having a luminous intensity of 1 candela.
3. The volume enclosed within the membranes of a mitochondrion or of the endoplasmic reticulum.
4. The bore of a catheter or hollow needle.
[L. light, window]

lumen

(lo͞o′mən)
n. pl. lu·mens or lu·mina (-mə-nə)
1. Anatomy The inner open space or cavity of a tubular organ, as of a blood vessel or an intestine.
2. Biology The interior of a membrane-bound compartment or organelle in a cell.
3. Abbr. lmPhysics The SI unit of luminous flux, equal to the amount of light per unit time passing through a solid angle of one steradian from a light source of one candela intensity radiating equally in all directions. See Table at measurement.

lu′men·al, lu′min·al adj.

lu·men

(lm), pl. lumina (lū'mĕn, -mi-nă)
1. The space in the interior of a tubular structure, such as an artery or intestine.
2. The unit of luminous flux; the luminous flux emitted in a unit solid angle of 1 steradian by a uniform point source of light having a luminous intensity of 1 candela.
[L. light, window]

lumen

The inside of any tube, such as a blood vessel, an air passage (bronchus) or the intestine.

lumen

any cavity enclosed within a cell, or structure, such as the lumen of the gut.

Lumen

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

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
sun109
car headlight107
incandescent lamp (tungsten)106-107
fluorescent lamp104-105
clear sky at noon104
cloudy sky at noon103
shady street by day103-104
full moon103
book print under artificial light>102
photopic vision>10
street illumination1-10−1
mesopic vision10-10−3
cloudless night sky with full moon10−2
scotopic vision<10−3
moonless and cloudless night sky10−3-10−6

lu·men

, pl. lumina (lūmĕn, -mi-nă)
1. Space in interior of a hollow tubular structure (e.g., artery or intestine).
2. The bore of a catheter or hollow needle.
[L. light, window]
References in periodicals archive ?
The new PLC-WM5500/L and PLC-WM4500/L high-resolution Wide XGA projectors reach brightness of up to 5,500 ANSI lumens, making them suitable for large venues, including conference rooms and lecture halls.
PLV-Z3000 Specifications Contrast Ratio: 65,000:1 Brightness: 1200 ANSI lumens Video Inputs: HDMI 1.3 x 2, Component x 2, D-sub 15pin, Composite (RCA), S-Video Control Ports: Mini DIN 8-pin (RS232) Dimensions: 15.75 (W) x 5.7 (H) x 13.6 (D) inches Weight: 16.5 lbs.
The REALiS WUXIO features a 0.71-inch LCoS reflective LCD panel, a contrast ratio of 1,000:1, a brightness of 3,200 ANSI lumens, and a 10-bit pixel depth for outstanding image quality.
It delivers 4,000 ANSI lumens with a variable SuperCR 1,600-2,000:1 full-field contrast ratio.
Its LED light source with 250 ANSI lumens lasts 30,000 hours while producing brilliant color.
"With 6200 and 5500 ANSI lumens, the NP4000 and the NP4001 projectors allow users to project crisp and bright images even in normal room light conditions.
It offers noise level of just 26/31 dB (eco/normal modes), 2,000 ANSI lumens, 1,000:1 contrast ratio, XGA resolution (1,024 x 768) and one integrated 5W speaker.
It features a filter-free DLP chip, as well as 4,000 ANSI lumens of brightness, XGA (1024x768) resolution and a 2,000:1 contrast ratio, while weighing less than 10 pounds.
It offers a brightness of 3,100 ANSI lumens, a resolution of 1024 x 768, and a contrast ratio of 400:1.
With high brightness (2000 ANSI lumens) to project a crystal-clear picture in any work environment, the projector has a native 1,024 x 768 XGA resolution and a condenser lens optical system to deliver rich black tones and sharp onscreen images.
Combined with 1,800 ANSI lumens, a razor-sharp contrast ratio of 2000:1 and XGA 1024 x 768 resolution, the TDP-T40U provides enhanced clarity, brightness and color fidelity for an impressive visual impact.
Mitsubishi XL5950 ColorView LCD projector offers 4700 ANSI lumens, horizontal and vertical lens shift, a contrast ratio of 600:1, and 3D CineView (a proprietary video technology that reduces flickering and artifacts).