Candela

This article is about the unit of luminous intensity. For other uses, see Candela (disambiguation).

candela
Photopic (black) and scotopic (green) luminous efficiency functions. The photopic includes the CIE 1931 standard (solid), the Judd–Vos 1978 modified data (dashed), and the Sharpe, Stockman, Jagla & Jägle 2005 data (dotted). The horizontal axis is wavelength in nm.
General information
Unit systemSI
Unit ofluminous intensity
Symbolcd
Conversions
1 cd in ...... is equal to ...
   international candles   ≈ 1.02 cp
   Hefnerkerze   ≈ 1.11 HK

Candela (symbol: cd) is the SI unit of luminous intensity. It measures the luminous power per unit solid angle emitted in a particular direction. A common wax candle has a luminous intensity of roughly 1 cd.

The word candela is Latin for candle. The old name "candle" is still sometimes used, as in foot-candle and the modern definition of candlepower.

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