An international unit of luminous intensity per projected area normal to the line of observation. Luminance may be described in units of Candelas per square meter, or nits.

A unit of luminous intensity equal to 1/60 of the luminous intensity per square centimeter of a blackbody radiating at the temperature of solidification of platinum (2,046°K). Also called candle.

International unit of measurement of the light intensity. Brightness can be expressed in Candelas per square meter (Cdm2).