SI ühikutesüsteemi valgustugevuse ühik, mis on võrdne valgustugevusega antud suunas allikast, mis kiirgab monokromaatilist kiirgust sagedusega 540 × 1012 Hz ja mille kiirgusintensiivsus selles suunas on 1/683 W/sr
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SI unit of luminous intensity, equal to the luminous intensity in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 Hz and has a radiant intensity in that direction of 1/683 W/sr
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