candela
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candela
(cd) [kan-del´ah]the base SI unit of luminous intensity.
can·de·la (cd),
(kan'de-lă),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).
Synonym(s): candle
[L.]
candela
The SI (International System unit) of luminous intensity in a given direction from a source emitting monochromatic radiation of a frequency of 540 X 1012 hertz, where the energy in that direction is 1.464 X 10-3/steradian.can·de·la
(kan-dē'lă)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 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian (solid angle).
[L.]
candela
The candela is the luminous intensity in a given direction of a source emitting monochromatic radiation of frequency 540 ✕ 1012 Hz and the radiant intensity of which in that direction is 1/683 watt per steradian. The candela so defined is the base unit applying to photopic quantities. Symbol: cd.