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A.
Adapter
A short length of cable with a type of plug and a different type
receptacle.
Amperes
The unit of measurement of electric current |
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B.
Ballast
An electrical device used with fluorescent or HID lamps to supply
sufficient voltage to start and operate the lamp but then to
limit the current during operation.
Ballast Factor
The measured ability of particular ballast to produce light
from the lamp(s) it powers; ballast factor is derived by dividing
the lumen output of a particular lamp/ballast combination by
the lumen output of the same lamp(s) on reference ballast.
Bi-Pin
This is the typical base for a fluorescent tube of 1 to 4 feet
in length. It consists of 2 prong contacts which connect into
the fixture. Medium bi-pins are used with type T-8 and T-12
tubular fluorescent lamps, and miniature bi-pins are used for
tubular T-5 fluorescent lamps. |
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C.
Candela (cd)
The unit of measurement of luminous intensity of a light source
in a given direction.
Candlepower
The unit of measure indicating the luminous intensity (candlepower)
of a light source in a specific direction; any given light source
will have many different intensities, depending upon the direction
considered.
Compact Fluorescent Lamp (CFL)
A small fluorescent lamp that is often used as an alternative
to incandescent lighting. The lamp life is about ten times longer
than incandescent lamps and is 3 to 4 times brighter. Also referred
to as PLI DL, CFL or BIAX lamps.
Color Temperature
The measurement of a color quality of a lamp measured in degrees
Kelvin. A standard 1000 watt tungsten halogen theatrical lamp
has a color temperature of around 3200 Kelvin.
Correlated Color Temperature (CCT)
A term used for discharge lamps, where no hot filament is involved,
to indicate that the light appears "as if the discharge
lamp is operating at a given color temperature. CCT generally
measures the "warmth" or "coolness" of light
source appearance using Kelvin (K) temperature scale.
Color Rendering Index (CRI)
Measure of the degree of color shift objects undergo when illuminated
by the light source as compared with the color of those same
objects when illuminated by a reference source of comparable
color temperature; a quality of the light. It is a measure of
the lamp's ability to `'render" colors accurately. |
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D.
Diffuser
Generally, something made of diffusion material.
In the film and video industries, a fabric panel, used for diffusing,
with the light source being a luminaire or sunlight. They are
available in a variety of sizes and shapes, and materials of
varying textures. |
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E.
Emergency Lighting
Emergency Lighting are a type of device, which may include lighting, generators and other apparatus, to provide backup resources in a crisis or when regular systems fail. They find uses in a wide variety of settings from residential homes to hospitals and scientific laboraties. Many emergency lighting rely on uninterruptible power supplies. |
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F.
Fluorescent Lamp
A type of lamp which converts UV light into visible light through
fluorescence. Fluorescent lamps are one of the least commonly
used lamps on stage |
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G. |
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H.
High Intensity Discharge (HID)
A type of lamp such as a mercury or sodium vapor lamp that produces
light by causing an inert gas to discharge photons. HID lamps
find special uses in entertainment lighting and make good UV
sources. HID lamps require special ballasts and are generally
not dimmable.
High Bay
High ceiling, usually in an industrial plant. Because of height,
it may be hard to reach for lamp changers without special ladders
or scaffolding. Usually above 20 ft.
High Pressure Sodium
These HID bulbs contain a sodium gas and produce a yellow/orange
light. They are very bright, and last up to 24,000 hours. |
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I. |
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J. |
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