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lumen
(redirected from lumenal)

    Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.04 sec.
lumen: see photometry photometry (fōtŏm`ətrē)
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lumen

A unit of measurement of the amount of brightness that comes 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 13 lumens; a 100 watt bulb generates 1,200 lumens.

Lumen Ratings for Data Projectors
When choosing a data projector, the lumen rating is an important specification. In a darkened room, 500 lumens may be ample; however, in a conference room with normal lighting, 1,000 lumens would be better. In a room with daylight, 2,000 lumens is preferred. The standard lumen rating of a data projector is the average of photometer readings at several points on a full white image on the screen. See ANSI lumen, candela and spectrum.



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Many of the airways from Mexico City also showed lumenal distortion (Figure 1C).
Chronic exposure to high levels of particulate air pollution and ... by Wright, Joanne L. / Environmental Health Perspectives
Light microscopy showed a well developed neointima lining the anastomotic region of the graft without apparent lumenal reduction.
Polyurethanes in vascular grafts by Szycher, Michael / Rubber World
Instead, evidence suggests that denervation leads to an "up-regulation" of muscarinic receptors that promotes increased calcium influx in the coronary arteries of the transplanted heart, facilitating a more insidious, diffuse, circumferential narrowing of arterial lumenal diameters.
Cardiac transplantation: a review by Sadowsky, H. Steven / Physical Therapy
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