footcandle


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Related to footcandle: lumen

foot·can·dle

(fut'kan-dĕl),
Illumination or brightness equivalent to 1 lumen per square foot; replaced in the SI system by the candela.
Farlex Partner Medical Dictionary © Farlex 2012

foot·can·dle

(fut'kan-dĕl)
Illumination or brightness equivalent to 1 lumen per square foot; replaced in the SI nomenclature by the candela.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

footcandle

Non-metric unit of illuminance. It is equal to a flux of 1 lumen per ft2. Symbol: fc. 1 fc = 10.764 lux.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
* The reduction of intensity of illumination requirements from 500 lux (46.5 footcandle) to 350 lux (32.5 footcandle), provides an energy savings of 9% final electricity consumption.
The first thing to determine is the number of horizontal footcandles (lumens per square foot) required on the pavement for various conditions.
Television coverage requires much higher light levels than those given in the standards, including footcandles on vertical surfaces.
The amount of illumination is expressed in a footcandles rating as read by the testing method described.
The Granville light rated the highest for relative efficiency with a score of 88.35 (average footcandle multiplied by spacing).
I could have three different apps to check footcandle levels and they'll give me three separate results that could be significantly different from each other," explains Fedoruk.
"The built environment is created for people and therefore the light in a space should serve their needs and desires, not just be engineered to a predetermined footcandle level," Berrigan said in an LD+A interview in 2013.
Note that recommended light levels are always for average maintained footcandles. Initial footcandle levels--when a system is first installed--may be as much as ten percent higher than maintained, but will drop off over time.
IES issues guidelines for the recommended footcandle level for different applications--visual tasks with small detail and high contrast can require as much as 50 fc, while the same job with low contrast could require up to 100 fc, according to Mark Havira, director of national accounts for Efficient Lighting Consultants.
If all criteria are met for a football field, including footcandle levels and uniformity, it may make more sense to install 1500-watt metal halide lamps instead of 1000-watt metal halide--even though the 1000-watt lamp has a longer life (10,000 hours compared to 5,000 hours).
"If you have five fixtures with the lamps burned out, that could pose a problem because now you're not meeting the required footcandle levels," Dixon says.