CANDELA

[can.de.la] n [L, candle] (1949): the base unit of luminous intensity in the International System of Units that is equal to the luminous intensity in a given direction of a source which emits monochromatic radiation of frequency 540E12 hertz and has a radiant intensity in that direction of[ ]1/683 watt per unit solid angle--called also candle--abbr. cd