Candela (cd)

Date added:
Monday, 11 July 2011

Last revised:
Tuesday, 12 July 2011


Answer

It is typically expressed in the measure of luminous intensity of a source in a given direction. The term has been retained from the early days of lighting when a standard candle of a fixed size and composition was defined as producing one candela in every direction. A plot of intensity versus direction is called a candela distribution curve and is often provided for reflectorized lighting devices and for luminaires with a lighting device operating in them.



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