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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 ?
We asked Facility 1 to replace all the missing bulbs, which brought it close to 50 foot-candles.
However, because the ceiling absorbs some of this light, it requires more foot-candles to achieve adequate lighting.
In general, the study found that sites with lighting levels below three foot-candles were given low security ratings, usually between -4 and 1.
With greater foot-candle performance and a life rating of 100,000 hours at L70, the new LED lighting fixtures help to increase light levels while reducing lighting energy costs and associated maintenance.
Adapted from the Cyberlux military-grade lighting technology, the ArcLight LED Lighting Systems are fully dimmable, have a color temperature range of 4100K to 5000K, come in various lengths and produce a range of maximum foot-candle levels depending upon the application.
The product reduces electrical consumption with negligible foot-candle loss and can obtain a savings of 15%.
The product can reduce electrical consumption with negligible foot-candle loss for a savings of up to 15%.
The installation of the lights, guaranteed to meet the NCAA, NBA and NHL foot-candle requirement, was completed last week.
By gating the time at which the ballasts in the T8 fluorescent lighting system draw power, it reduces electrical consumption with negligible foot-candle loss (field testing on the above ballasts yielded foot-candle losses of 2.
The Axis DDH ballast provides a solution for these airports to lower light levels to minimum foot-candle requirements at night and to dim the fixtures during daylight hours for further energy conservation and savings.
Designed and built in Manitowoc, Wisconsin, energybank technology prioritizes the optimization of the light engine as a system that delivers maximum foot-candles without compromise.
Light is measured in foot-candles -- the amount of light cast on a square foot area by a candle at 1 foot distance -- and the sun on a clear summer day can bathe us in 10,000 foot-candles.