Candela

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

  1. NIST. Base unit definitions: Candela [Online] Available: http://physics.nist.gov/cuu/Units/candela.html
  2. SI Units Explained. Luminous Intensity [Online] Available: http://www.si-units-explained.info/luminosity/

Authors and Editors

Jordan Hanania, Kailyn Stenhouse, Jason Donev
Last updated: February 18, 2016
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