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 ?
In the interest of educating the readership regarding the confusion around the lumen, I refer to Joseph B.
The Lumens were incorporated into this awards program, even as the Lumen Awards continued to expand rapidly and continuously evolved to meet the needs of the IESNYC members and others who submitted projects for consideration of a Lumen Award.
The resounding success of the Ardo project is a win-win for everyone involved--the Titchfield Group, Ardo UK and Digital Lumens," said Michael Feinstein, Digital Lumens Vice President of Sales and Marketing.
70 could be employed by moving up along the lumen depreciation curve.
The lumen spins, stops, then spins in the other direction.
To stay competitive, and provide application mobility, developers and ISV's need a development environment that allows them to provide products for 'all' their customers regardless of the Operating System," commented Tad Gordon, CEO at Lumen Software.
Some tubes have an open lumen, and some have a semipermeable membrane.
Lot 1 comprises of 11 Product Lines: 1) Bag Spike; 2) Connector/valve; 3)Extension Sets Double Lumen 3 cm; 4)Extension Sets Double Lumen 11 cm; 5) Extension Sets Double Lumen 15 cm; 6) Extension Sets Double Lumen 23 cm; 7) Extension Sets Single Lumen 11 cm; 8)Extension Sets Single Lumen 15 cm; 9) Extension Sets Triple Lumen 11 cm 1; 10) Extension Sets Triple Lumen 15 cm 1; 11) Extension Sets Triple Lumen 21 cm.
The lumen maintenance is stated to be up to 95 percent.
The Illuminating Engineering Society New York City Section (IESNYC), the largest section in the Society, announced the recipients of the 2013 Lumen Awards at the 45th annual Lumen Gala, the most celebrated lighting event in New York City.
Leupold's Golden Ring MXc series of flashlights includes six models in various lengths, weights and lumen settings.