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 ?
The researchers generated a new transgenic line-allowing lineage tracing of ER+ luminal cells to investigate luminal cell heterogeneity and identify the origin of ER+ luminal cells and the mechanisms regulating their pubertal expansion and adult maintenance.
Out of these, twelve were luminal B HER 2 positive and nine were her 2 over expressed.
For luminal waves the speed of propagation is, by definition, fixed and any luminal wave model of a subluminal massive particle is immediately subject to the kinematic constraint that, when the speed of the particle changes, the speed of its constituent wave components does not.
11) Semiquantitative evaluation of Ki-67 and PR is helpful for further typing of the luminal subtype, (25-27) and evaluation of cytokeratin 5/6 (CK5/6) and epidermal growth factor receptor (EGFR) help to identify the BLBC among the TNBC.
Asimismo, los siguientes subtipos para cada clase molecular: Luminal A: a) segun grupos de Ki-67 y b) segun la expresion de marcadores de tipo basal.
Another important point is that GSTP1 presents heterogeneous expression in benign tissue: it strongly stains healthy gland basal cell layer, while it frequently shows a weaker positivity or even an absence of staining in luminal cells (Figures 1 and 2).
Figure 3: CECT Abdomen axial image showing complete luminal occlusion of External Iliac Vein on right & partial occlusion on left (yellow arrow) & normally filled External Iliac arteries (white arrow).
Luminal A molecular subtype was observed in 50% in age groups 40 to 50 and above 50 years.