| candlepower (kān'dl-pou'ər) Pronunciation Key
Luminous intensity, expressed in candelas. |
candlepower
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."
Learn more about candlepower with a free trial on Britannica.com.