Definitions for illumination, unit of
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The Standard Electrical Dictionary
Illumination, Unit of
An absolute standard of light received by a surface. Preece proposed as such the light received from a standard candle (see Candle, Standard) at a distance of 12.7 inches. The object of selecting this distance was to make it equal to the Carcel Standard (see Carcel), which is the light given by a Carcel lamp at a distance of one meter. From one-tenth to one-fiftieth this degree of illumination was found in gas-lighted streets by Preece, depending on the proximity of the gas lamps.
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"illumination, unit of." Definitions.net. STANDS4 LLC, 2016. Web. 14 Feb. 2016. <http://www.definitions.net/definition/illumination, unit of>.