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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 ?
By changing that, we were able to get the foot-candles up to 25.
For example, properties with nighttime lighting systems that provided three to seven foot-candles received similar ratings of between 3 and 4, with one site receiving a rating of almost 5.
The unit delivers a lamp color temperature of 3250 [degrees] Kelvin with an output of 350,000 foot-candles.
If you over-light something, and people leave your establishment, they have to re-adapt to the one foot-candle of the roadway.
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.
In addition to eliminating noise from the fixtures throughout the facility, the Albeo lighting fixtures also have a rated lifetime of 100,000 hours and provide greater foot-candle performance, helping to increase light levels while further reducing energy use and maintenance burdens on the facility.
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.
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%.
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.
Typically, urban planning goals are to flood areas with as many foot-candles of light as possible.