Triang wrote:"candle power"
A candle
Candlepower (abbreviated as cp) is an obsolete unit expressing luminous intensity, equal to 0.981 candela. It expresses levels of light intensity in terms of the light emitted by a candle of specific size and constituents. In modern usage candlepower equates directly to the unit known as candela.
"Candlepower" is largely an obsolete term.
However, it is still sometimes used to describe the luminous intensity of high powered flashlights and spotlights. Narrow-beamed lights of all sorts can have very high candlepower specifications, because candlepower measures the intensity of the light falling on a target, rather than the total amount of light emitted. A given lamp will have a higher candlepower rating if its light is more tightly focussed.[2]
Only a few artificial light sources, such as military photoflash bombs, have the very high candlepower ratings characteristic of narrow-beamed spotlights but, simultaneously, a wide unfocussed distribution of light.