standard candle

World English Dictionary
standard candle
 
n
candela See also international candle a unit of luminous intensity; the candela: not in scientific usage because of possible confusion with a former unit (international candle)

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Encyclopedia Britannica
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standard candle

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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