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see photometryphotometry
, branch of physics dealing with the measurement of the intensity of a source of light, such as an electric lamp, and with the intensity of light such a source may cast on a surface area.
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Luminous intensity expressed in candelas. The term refers only to the intensity in a particular direction and by itself does not give an indication of the total light emitted. The candlepower in a given direction from a light source is equal to the illumination in footcandles falling on a surface normal to that direction, multiplied by the square of the distance from the light source in feet. The candlepower is also equal to the illumination of metercandles (lux) multiplied by the square of the distance in meters.

The apparent candlepower is the candlepower of a point source which will produce the same illumination at a given distance as produced by a given light source.

The mean horizontal candlepower is the average candlepower of a light source in the horizontal plane passing through the luminous center of the light source.

The mean spherical candlepower is the average candlepower in all directions from a light source as a center. Since there is a total solid angle of 4π (steradians) emanating from a point, the mean spherical candlepower is equal to the total luminous flux (in lumens) of a light source divided by 4π (steradians). See Luminous intensity, Photometry


Luminous intensity expressed in candelas. Abbreviated cp.

candlepower (cp)

The luminous intensity of a light source, expressed in candelas. Abbr. cp. Also see apparent candlepower.


the luminous intensity of a source of light in a given direction: now expressed in candelas but formerly in terms of the international candle
References in periodicals archive ?
The minimum recommendation is 75 candlepower, and we exceed that," Waters says.
BY INSTALLING this "Chinese" water frippery, Albert Dock Company surely sets a precedent for anchoring the Planet lightship mid-dock and reinstating its light (600,000 candlepower rotating at five second intervals) and foghorn (five mile radius), for activation during city celebrations?
The aviators turn on a 30-million candlepower beam called a Nightsun that's mounted beneath the chopper, as they direct the agents to the material.
Then a massive 120-million candlepower light zeroed in on the target.
Illuminated by dark-as-a-dungeon candlepower and battered by the incessant street music of man and his machines, these cramped rooms and miserable alleys are home to a strangely bestial crowd of humanity--not just the usual pimps and whores and violent drunks but people with pointed ears, protuberant teeth and excessive facial hair.
But if a seductive atmosphere is what you're after, candlepower beats kilowatts every time.
The Hungry Moon, Harvest Moon, Hunter Moon, are each emotional, and expertise about their candlepower or mileage from the earth a bit extraneous.
Even some of Reagan's friends and supporters on the right had their doubts about his intellectual candlepower," writes biographer Lou Cannon in President Reagan: The Role of a Lifetime (1991).
The lighthouse's beacon boasts an illumination of 1 million candlepower and flashes every 20 seconds as it rotates.
That the candlepower of the vision meet a minimum quantity?
We'll soon learn how many lumens of candlepower will or will not be focused on the NYSE directors who approved his lavish compensation packages.
Aladdin Mantle Lamps use kerosene and emit 60 candlepower of light without smoke or odor.