Coefficient of utilization

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Coefficient of utilization

A measure of the efficiency of a light fixture: the ratio of the luminous flux reaching a surface to the total lumen output of the fixture. This is found in the photometric test report as the percentage of total lamp lumens generated within the fixture that actually reach the work plane. It is based on the efficiency of the fixture.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

coefficient of utilization, Brit.

utilization factor. The ratio of luminous flux received on the work plane to the total luminous flux emitted by the source.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
If we call the ratioas [k.sub.m] = [[summation].sup.n.sub.i=1][m.sub.i]/M the coefficient of utilization of nominal load-carrying capacity, (2) theoretically the most optimal (ideal) value of criterion would be km=1.
Design calculations of the light level expected include approximations of the room size, the luminaire's coefficient of utilization, lamp lumens and luminaire depreciation, room interior finishes, furniture, obstructions and occupants--all of which are educated guesses.
Therefore, the increase in the formation rate of these insoluble complexes in the digestive tract of the broilers fed the negative control diet, without phytase, resulted in greater excretion of Ca followed by worsening of its coefficient of utilization.
The coefficient of utilization of the Cobra lamp is excellent; about 50 percent.
Lumen output, luminaire coefficient of utilization, room sizes and their reflectance, and lamp and luminaire depreciation all have tolerances associated with them.
We need to appreciate lumens, luminance and coefficient of utilization, for example, just to read a cutsheet.

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