Candela: Difference between revisions
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<onlyinclude>The '''candela''' (cd) is the [[SI]] unit of luminous intensity, which is | <onlyinclude>The '''candela''' (cd) is the [[SI]] [[units|unit]] of [[luminous intensity]], which is a measure of [[power]] emitted from a light source.</onlyinclude> The definition for a candela is:<ref name=web1>NIST. ''Base unit definitions: Candela'' [Online] Available: http://physics.nist.gov/cuu/Units/candela.html </ref> | ||
The luminous intensity, in a given direction, of a source that emits monochromatic [[radiation]] of [[frequency]] 540 x 10<sup>12</sup> [[hertz]] and that has a radiant intensity in that direction of 1/683 [[watt]] per steradian. | The luminous intensity, in a given direction, of a source that emits monochromatic [[radiation]] of [[frequency]] 540 x 10<sup>12</sup> [[hertz]] and that has a radiant intensity in that direction of 1/683 [[watt]] per steradian. | ||
Latest revision as of 04:31, 18 February 2016
The candela (cd) is the SI unit of luminous intensity, which is a measure of power emitted from a light source. The definition for a candela is:[1]
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.
Candela is Latin for the word 'candle', and a typical candle's luminous intensity is actually about equal to one candela.[2]
Visit Dr. Rowlett's unit dictionary to learn more about the candela, and learn more about luminous intensity here.
References
- ↑ NIST. Base unit definitions: Candela [Online] Available: http://physics.nist.gov/cuu/Units/candela.html
- ↑ SI Units Explained. Luminous Intensity [Online] Available: http://www.si-units-explained.info/luminosity/