lumen


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lumen:

see photometryphotometry
, branch of physics dealing with the measurement of the intensity of a source of light, such as an electric lamp, and with the intensity of light such a source may cast on a surface area.
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Lumen

A unit of light from one source. Light falling on 1 square foot of surface of an imaginary sphere having a 1-foot radius around 1 candle.

Lumen

 

the unit of luminous flux in the International System of Units. Symbol, 1m. One lumen is the luminous flux emitted by an isotropic point source in a with a luminous intensity of 1 candela in a solid angle of 1 steradian.

lumen

[′lü·mən]
(anatomy)
The interior space within a tubular structure, such as within a blood vessel, a duct, or the intestine.
(optics)
The unit of luminous flux, equal to the luminous flux emitted within a unit solid angle (1 steradian) from a point source having a uniform intensity of 1 candela, or to the luminous flux received on a unit surface, all points of which are at a unit distance from such a source. Symbolized lm.
(science and technology)
The space within a tube.

lumen (lm)

The SI unit of luminous flux equal to the luminous flux received on a unit surface, all points of which are equidistant from a point source having a uniform intensity of 1 candela.

lumen

A unit of measurement of the light intensity radiating in the air in all directions from a light source. Lumens define "luminous flux," which is energy within the range of frequencies we perceive as light. For example, a wax candle generates about 13 lumens; a 60-watt bulb approximately 800, and a 100-watt bulb 1,600 lumens.

Lumen Ratings for Data Projectors
When choosing a data projector, the lumen rating is an important specification. In a small, dark room, 500 lumens may be ample; however, in a conference room with normal lighting, 1,000 to 2,000 lumens is required. In a large, well-lit room, at least 2,000 lumens is necessary. This rating is derived by taking the average of photometer readings at several points on a full white image on the screen. See lux, ANSI lumen, Lm/W, candela and spectrum.
References in periodicals archive ?
It replaces 150-W halogen lamps while consuming 25 watts, and also comes in 900 and 1,200 lumen packages.
This year, the jury honored three firms with a Lumen Award of Excellence: Tillotson Design Associates' East River Waterfront Pier 15 and Esplanade in New York, Cooley Monato Studio's Mall of America East Boulevard Renovation, in Bloomington, MN; and Fisher Marantz Stone's Chapel at Miho Institute of Aesthetics in Shigaraki, Japan.
The commingling of life and lumen maintenance for LED lighting systems is unlike what occurs with more traditional light sources.
Khimjia€™s Lumen Zone is a unique concept to the GCC region, it allows customers to see, feel and choose their preferred lighting.
For the double-lumen tube group, a suction catheter was passed into the endobronchial or endotracheal lumen of the non-ventilated lumen and suction applied.
The lumen spins, stops, then spins in the other direction.
Lumen provides organizations and developers with the tools to create localized (multi-lingual) applications that operate in a cross-platform environment (Linux, Windows, Unix, MacOS).
Some tubes have an open lumen, and some have a semipermeable membrane.
The Illuminating Engineering Society New York Section (IESNY) is accepting online submissions for the 39th Annual Lumen Awards now through January 12, 2007.
U5-632 is a 2,200-lumen projector offering 3,000 lumens in bright mode.
How do you make a one-piece silicone medical tube that has one lumen on one end and two lumens on the other?