candle(redirected from couldn't hold a candle)
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The SI unit of luminous intensity, 1 lumen per m2; the 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 per steradian (solid angle).
Etymology: L, candela, light
(in optics) the basic unit of measurement for luminous intensity, equal to 1/60 of the luminous intensity of a square centimeter of a black body heated to 1773.5° C or the solidification temperature of platinum, adopted in 1948 as the international standard of luminous intensity. Also called candela [kandē′lə] .
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