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A
A.B.T.T.
The Association of British Theater Technicians.
A.J. / AJ
n. Jargon for an Adjustable Spanner. (UK) Known in the US as a C Wrench (short for Crescent Wrench).
A.L.D.
Association of Lighting Designers.
A1
Lighting Industry Forum code which identifies the (original) recommended usage of different lamp types. A1 coded lamps are for use in projection.
AC
Alternating current (AC) moves in a single direction; however, that direction is reversed at regular intervals. Alternating current is the prevailing electrical current in use today.
ACL (AIRCRAFT LANDING LIGHT)
A 28 volt very narrow beam PAR lamp (used on aircraft) often adapted for use in PAR64 and PAR46 fixtures. ACLs are commonly wired with 4 lamps in series to bring the required voltage of the circuit close to 120 volts. ACL lamps are typically brighter, more intense, and have a higher color temperature than standard PAR lamps. They typically are more expensive and have a shorter lamp life.
ACN
Advanced Control Network. New show control protocol being developed by ESTA using ethernet. Designed to improve on the limitations of DMX512.
ACTING AREA
The portion of the stage viewed by the audience during a scene.
ADAPTOR
Connector which allows two or more electrical devices to be connected to a single power outlet. The connection is normally parallel, that is, each device is fed the same voltage, but the current is divided between them. Sometimes known as a "Twofer". A three-way splitter is known as a "Threefer". A Series splitter is also available where a voltage is shared equally between two loads. Also an ADAPTOR can be the same as a JUMPER.
ADB
Belgian manufacturer of lanterns, control desks and dimming equipment. Named after the initials of its founder, Adrian de Backer.
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