Coefficient of Utilization

A measure of the efficiency of a light source in transferring energy to the working plane.

In lighting design, a coefficient of utilization is a measure of the efficiency of a light source in transferring energy to the working plane in a particular area. The CU is the ratio of luminous flux from a luminaire incident upon a work plane to that emitted by the lamps within the luminaire. As a ratio, the coefficient of utilization is unitless.

For example, some of the light emitted by a luminaire may exit away from the desired plane and is therefore wasted. A CU measures the light actually reaching the desired plane as a percentage of the total light produced by the fixture. The value for direct lighting varies from 0.2 to 0.5 while that of indirect lighting varies from 0.1 to 0.3.

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Coefficient of Utilization
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  • CU
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Adapted from content published on wikipedia.org
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Last modified on May 23, 2021, 12:08 am
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