noun Optics.
(formerly) a measure of luminous intensity expressed in candles.
Also, candle power.

1875–80; candle + power Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
candlepower (ˈkændəlˌpaʊə)
the luminous intensity of a source of light in a given direction: now expressed in candelas but formerly in terms of the international candle

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Science Dictionary
candlepower   (kān'dl-pou'ər)  Pronunciation Key 
Luminous intensity, expressed in candelas.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


unit of luminous intensity in the International System of Units (SI), defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 1012 hertz and has a radiant intensity in that same direction of 1683 watt per steradian (unit solid angle). The candela has replaced the standard candle or lamp as a unit of luminous intensity in calculations involving artificial lighting and is sometimes called the "new candle."

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
There is some controversy over who first placed parabolic mirrors behind flames to boost candlepower.
From a writer of such heavy intellectual candlepower, this seems a rather narrow, even maudlin view of the art.
The luminaire light distribution category when there is no candlepower limitation in the zone above maximum candlepower.
However, the word candlepower persists as a legacy term in common use.
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