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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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A unit of measurement for the average light on a surface; 1 foot-candle equals 1 lumen per square foot.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
To calculate foot candles at your work surface, divide candlepower by the square of the distance from light to surface.
Entrances into parking structures should feature at least 60 foot candles of illumination to ease the transition from a bright exterior into the garage.
As the lighting level of a site approached three foot candles, the security ratings increased significantly.
Simmons projects a 28-month payback for the overall project, which will cut electrical consumption for lighting in half, from 361 kilowatts to 140, with the same 72 foot candles of light intensity at desk level.
Twice as bright as many LED headlights with 54,000 Lux / 5,000 foot candles of light, the Infinity can outperform many tethered fiber-optic lights without the high maintenance costs.
According to Gorsky, at the work plane of 36 inches off the floor, with all the case and accent lighting turned off, the light measures 30 to 35 foot candles, and after the accent and case lighting are taken into consideration there is at least a 4-to-1 or 5-to-1 ratio.
Foot candles are allocated with discretion to task and location, not according to an overall set formula.
An ingenious automatic control system limits the light levels to about 70 foot candles when the building is in a cooling mode, and controls the lights so they are only used when daylight is insufficient.