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Related to footcandle: lumen
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Noun1.footcandle - a unit of illuminance on a surface that is everywhere 1 foot from a point source of 1 candle
illumination unit - a measure of illumination
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0 footcandle for the average illuminance on the streets and sidewalks.
Many lighting specifiers would try to meet these design objectives by looking for a recommended footcandle level in an application guide.
Establish fundamental foundations for lighting practice based upon available experimental data pertaining to such matters as brightness and brightness-ratios in the visual field, brightness-levels, visibility-levels, footcandle specifications for various tasks and other factors dealing with visibility, comfort and ease of seeing.
This performance is based on the visual effective lumens (VEL) of Induction lamps, versus the traditional outdoor footcandle measurement criteria developed for HID lamps many years ago.
Three factors affect the amount of footcandle illumination available at any given point.
By having the newly installed 95-watt LED cluster of light project upwards from the top of the pendant bowl directly into the upper reflector surface, the library actually achieved higher task area footcandle measurements than with the use of the old bulbs.
Most state sanitary codes base illumination requirements on the footcandle, as do OSHA, NSF, the American Public Health Association, the American National Standards Institute, the Joint Commission on the Accreditation of Health Care Organizations, and the American Correctional Association.