Luminous Exitance

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Related to Luminous Exitance: Luminous emittance

luminous exitance

[′lü·mə·nəs ′ek·səd·əns]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Luminous Exitance


a photometric quantity. The luminous exitance from a point of a surface is the ratio of the luminous flux emitted from an infinitesimal element of surface containing the given point to the area of the element. The unit of luminous exitance in the International System of Units is the lumen per square meter (lm/m2). Radiant exitance, the analogous radiometric quantity, is measured in watts per square meter.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.