^ http://purl.obolibrary.org/obo/UO_0000014

"A luminous intensity unit which equal to the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian." [BIPM:BIPM, NIST:NIST]

candela

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