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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 ?
You can translate those needed foot-candles into light measured by a digital SLR camera.
I believe in having 100 to 150 foot-candles," he says.
We asked Facility 1 to replace all the missing bulbs, which brought it close to 50 foot-candles.
Entrances should attain an average of 10 foot-candles of illumination, or twice the level of the immediate surroundings, whichever is greater.
The court found that lighting in each death row cell was less than twenty foot-candles, in violation of the constitutional rights of the class members.
Seventy-five percent of coolers met the standard of 10 foot-candles (ft-c).
Historically, light meters that measure only instantaneous light intensity in foot-candles were used.
However, because the ceiling absorbs some of this light, it requires more foot-candles to achieve adequate lighting.
Peter Boyce (Lighting Research Center) presented data that show people don't feel safer at lighting levels of more than 5 foot-candles, debunking the "more-is-better" myth that pervades nighttime lighting practices.
Overhead fixtures cast the required 50 foot-candles for worksurfaces everywhere - even in hallways.
It emits 13,00 foot-candles, producing a color-corrected, white light for truer representation of tissue color.