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Facet
Side of a prism, seen most often in crystal glass chandeliers and other wall fixtures.
Fade Rate
The time it takes each zone/channel to arrive at the next scene dependent on the degree of change in light level.
Fade Time
The time it takes all zone/channels to fade from one lighting scene to another with all zones/channels arriving at the next scene at the same time.Figure Lamps
A staple of Art Deco design and lighting. From this period most figure lamps portray a female figure, often holding a globe shade. Victorian figure lamps often involve cherubs or young maidens. Animal and Cartoon figures in children’s lighting are more modern examples.Filament
The tightly coiled tungsten wire of an incandescent lamp; glows to produce light when electricity flows through it.Fill Gas
In incandescent lamps, usually argon or krypton with trace nitrogen. In fluorescent lamps may be argon. Halogen is used in halogen incandescent lamps.
Fluorescence (Fluorescent) is a luminescence that is mostly found as an optical phenomenon in cold bodies, in which the molecular absorption of a photon triggers the emission of a photon with a longer (less energetic) wavelength. The energy difference between the absorbed and emitted photons ends up as molecular rotations, vibrations or heat. Sometimes the absorbed photon is in the ultraviolet range, and the emitted light is in the visible range, but this depends on the absorbance curve of the particular material.
Within the context of lighting control, Fluorescence is typically associated with fluorescent lamps.
Fluorescent Lamps
A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapor. The excited mercury atoms produce short-wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light.
Unlike incandescent lamps, fluorescent lamps always require a ballast to regulate the flow of power through the lamp. However, a fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp; lower energy costs offsets the higher initial cost of the lamp.
Flushmount
A type of ceiling fan that mounts directly to a junction box, and do not have a down-rod to maintain maximum clearance from the floor.Footcandles
Unit of illuminance (light falling on a surface). One lumen falling on one square foot equals one-foot candle. Also, a measurement of the amount of light reaching a subject.Flame-In Kit
Part of a recessed downlight connected to the electrical circuit and generally installed when the ceiling is open. The electrified mounting form or housing which supports the optical assembly of a recessed fixture. Frame-In Kits are of various types according to the nature of the construction and the lamp.Framing Projector
Fixture with lens and shutters, creating an adjustable, sharp-edged beam to outline pictures and other objects.
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