The luminous intensity of a light source expressed in candles. Candlepower is a measurement of light intensity. It is used as a measurement of beam intensity at various angles from reflector lamps or fixtures.
Initial mean spherical candlepower at the design voltage. Mean spherical candlepower is the generally accepted method of rating the total light output of miniature lamps. To convert this rating to lumens, multiply it by 12.57 (4 pi).
Luminous intensity expressed in candelas. Plots of luminous intensity, called candlepower distribution curves, are used to indicate the intensity distribution characteristics of reflector-type lamps. A measure of intensity mathematically related to lumens. Candlepower is often to measure the intensity of lamps that project light.