17-117

candela

SI base unit for photometry: luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540×1012 Hz and that has a radiant intensity in that direction of 1/683 W·sr-1

Symbol: cd = lm·sr-1

NOTE Defined by the 16th General Conference of Weights and Measures, 1979.

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