lumen

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Related to Luminal: veronal, Seconal, lumen

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 ?
Elevated mRNA expression of immune markers such as PD-L1, cytotoxic T-lymphocyte-associated protein 4 (CTLA4), B7H-3, and IDO1 was noted in the ER+HER2- luminal population, which included the ER+PR- and ER+PR+ cohorts.
The Invest Maryland program is a key economic development initiative administered by the State s Maryland Venture Fund, has awarded Luminal a $600,000 investment.
The researchers found that Luminal cancers had the lowest frequency of mutations among the four subtypes of cancer, but had higher numbers of genes with mutations.
In the United States, XIENCE V is indicated for improving coronary luminal diameter in patients with symptomatic heart disease due to de novo native coronary artery lesions (lesions </= 28 mm) with reference vessel diameters of 2.
In the upper GI cohort, 39 individuals had luminal wall thickening seen on CT scans.
Luminal cells express CKs 7, 8/18, and 19; ER; and epithelial membrane antigen.
The vProtect(TM) Luminal Shield is a self-expanding nitinol device designed to treat soft, recently ruptured and at-risk lesions in coronary arteries.
The ER-positive group is characterised by higher expression of a panel of genes associated with luminal epithelial cells ('luminal' cancer).
The researchers enrolled 143 patients (64% men, age range 63-76 years) scheduled to undergo elective internal carotid artery stent placement due to luminal narrowing of 80% or greater.
The specimen was made up of pleomorphic spindle cells with an indistinct luminal formation (figure 2).
Inhaled ultrafine titanium dioxide particles were found on the luminal side of airways and alveoli, in all major lung tissue compartments and cells, and within capillaries.
Acute luminal gain was defined as the difference between minimum lumen diameter post-PTCA and minimum lumen diameter before PTCA (mm), late luminal loss as the difference between minimum lumen diameter at follow-up, and minimum lumen diameter immediately after PTCA (mm).