19 Terms
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Lighting products
Industry: Lights & lighting
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Lighting products
fixture requirements
Lights & lighting; Lighting products
Describes fixture requirements for HID lamps. O = Open or Enclosed Fixtures; E = Enclosed Fixtures Only; S = Lamps operated in a vertical position (Base Up or Down) ±15º, can be used in an open ...
flicker
Lights & lighting; Lighting products
The periodic variation in light level caused by AC operation that can lead to strobe effects.
flood
Lights & lighting; Lighting products
Used to refer to the beam pattern of a reflector lamp, which disperses the light over a wide beam angle, typically 20 degrees or more. ("Flood" as opposed to "spot")
floodlight
Lights & lighting; Lighting products
A luminaire used to light a scene or object to a level much brighter than its surroundings. Usually floodlights can be aimed at the object or area of interest.
fluorescence
Lights & lighting; Lighting products
A physical phenomenon whereby an atom of a material absorbs a photon of light an immediately emits a photon of longer wavelength. If there is a significant delay the phenomenon is called ...
fluorescent lamp
Lights & lighting; Lighting products
A high efficiency lamp utilizing an electric discharge through inert gas and low pressure mercury vapor to produce ultraviolet (UV) energy. The UV excites phosphor materials applied as a thin layer ...
foot candles
Lights & lighting; Lighting products
A unit of illuminance or light falling onto a surface. It stands for the light level on a surface one foot from a standard candle. One footcandle is equal to one lumen per square foot. See also Lux.
