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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.
References in periodicals archive ?
To calculate foot candles at your work surface, divide candlepower by the square of the distance from light to surface.
For example, the lighting within 50 feet of stairs and elevators should be increased to 40 foot candles of light to create a brighter, safer area.
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.
The stage is fairly well-lit-with a range from about 50 to I 10 foot candles," Knight says.
Inspection of plated parts is enhanced by more than 100 foot candles of light throughout the plant.
3(jm particles) Power: 120VAC, 50/60 Hz (220VAC available) Noise: 54 dBA, measured 30" from filter face @ 90 fpm Light: 120VAC, 50/60Hz fluorescent, 4-tube fixture; generates 4560 foot candles Curtain: Cleanroom vinyl curtain mounted on roller assembly; adjustable at any point along the 6' width of the clean room to create desired anteroom size Compounding Clean Rooms Panel Type * Dimensions (nominal) Cat.
At over 7,500 foot candles (81,000 lux) of light, the Infinity's LED easily outperforms other conventional lights, but with no bulbs to replace.
The idea is to keep the ambient lighting fairly low while hitting the products with a much higher level of foot candles.