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 ?
A Lumen Citation is given in recognition for an art installation, technical detail, portion of a single project, temporary installation, or other work.
Given the chance, de Lumen says he wants to work with movie stars Jessie Mendiola and Janella Salvador.
Smith added that the by performing the airdrop, Blockchain would give its customers more utility by way of introducing "high-quality coins," in this case, Stellar Lumens.  The company also expects the giveaway will accelerate growth in its wallet downloads.
Double lumen endotracheal tubes are the most frequently used method of one lung ventilation.
Coun Ged Bell said: "Newcastle Helix is nothing less than a game-changer for future growth in Newcastle, and the work starting on The Lumen sends out the strongest possible message that Newcastle is a city on the up and open for business.
For the descending aorta at the level of the diaphragm, significant differences between the expansion group and the stable group were observed in the false lumen but not in the true lumen (Table 2).
Expected lumen maintenance: The calculated L70 value sometimes exceeds the intended product use cycle or the lifetime of another lighting system component, the DOE explains.
The company said the ARROW Triple Lumen Pressure Injectable Acute Hemodialysis Catheter is available in the ARROW ErgoPack System, helping hospitals maintain compliance with current vascular access guidelines and standards while providing maximal barrier protection against infections when inserting these lines.
It must provide passage for gas, fluid, electronics, and even small devices to travel seamlessly, sometimes with several of those components within the same single tube (just through different lumens).
* The XB-H LED delivers up to 499 lumens at 5W, 85[degrees]C.
To be enrolled in the study, patients had to have a newly inserted triple lumen CVC (<12hrs), and all the lumens had to be patent.
FindtheBest co-founder Kevin O'Connor fought the case after it was decided Lumen View Technology's litigation was meritless, and the executive even took to the blogosphere to fight his cause.