define candela !!!!!!
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Candela (cd), unit of luminous intensity in the International System of Units (SI), defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and has a radiant intensity in that same direction of 1/683 watt per steradian (unit solid angle).
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The candela is the base unit of luminous intensity in the International System of Units; that is, luminous power per unit solid angle emitted by a point light source in a particular direction. Wikipedia
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