Candela

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Candela

(symbol cd) 

The luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 * 10¹² hertz and that has a radiant intensity in that direction of (1/683) watt per steradian (16th CGPM (1979), Resolution 3).
The previous is an excerpt from WWW version of the National Institute of Standards and Technology: Physics Laboratory's International System of Units (SI)
Also called candle. [[/A>|/A>]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use