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glossary
 
A-BC-DE-FG-KL-NO-ST-Z



E

Effect
An event or a moment intended to create a particular emotional reaction.

Effect Lighting
Lighting intended to create a mood or an impression.

Effect Wash
Effect Lighting covering a broad area.

Ellipsoidal
A luminaire embodying a lamp, an ellipsoidal reflector, a framing device, and a single or compound lens system, together with provisions for accommodating a pattern holder and patterns.

F

Fade
To gradually increase or decrease the intensity of light. Far Cyc A cyclorama light placed at a distance from the cyclorama generally 8' or more.

Fay Light
A luminaire that uses incandescent parabolic reflector lamps with a dichroic coating to provide "daylight" illumination.

Feeder Cables
A set of electric cables, usually individually insulated conductors with a high ampacity, used to remotely connect portable racks, power distribution racks etc.

Field Angle
The angle a which the beam edges are 10% of the centre beam candlepower.

Fill Light
Supplementary illumination used to reduce shadows. First Electric The electrics pipe and/or its position, which is located immediately upstage of the proscenium arch.

Fixture
A lighting unit, or luminaire.

Flag
To wave an object or a hand in front of an instrument to determine its coverage area.

Flood
To adjust a luminaire usually by moving the lamp closer to the lens; enlarging the diameter of the beam of light emitted.

Floodlight
A luminaire consisting of only a lamp and reflector with fixed spacing; generally, the reflector has a diffused finish and is often physically large in size. The widest field of illumination from a luminaire.

Floor Pocket
A wiring device with receptacles recessed into to the floor with a hinged cover.

Flux
A measure of the amount of light. The unit is often the Lumen.

Focus
To aim a lighting fixture, or to adjust a fixture's beam.

Focusing Instrument
A lighting instrument whose beam size can be varied.

Follow Spot
A lighting instrument used to follow a performer on stage.

Footcandle
A unit of illumination. 1 footcandle = 1lumen/ft2.

Fresnel
A lighting instrument using a fresnel lens. (softedge beam).

Fresnel Lens
A lens that acts similarly to a piano-convex lens but is thinner and lighter due to steps on the convex side. Often the flat side has a rough surface to smooth light beams by slightly diffusing the light.

Fresnel Spotlight
A luminaire embodying a lamp and a fresnel lens, with or without the reflector, which has a soft beam edge. The field and beam angles can be varied by changing the spacing between the lamp and lens.

Front-Of-House
The complete area of the theatre in front of the stage.


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