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A
A1
Lighting Industry Forum code which identifies the (original) recommended
usage of different lamp types. A1 coded lamps are for use in projection.
A.B.T.T.
The Association of British Theater Technicians.
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.
ACTING AREA
The portion of the stage viewed by the audience during a scene.
ACN
Advanced Control Network. New show control protocol being developed by ESTA
using ethernet. Designed to improve on the limitations of DMX512.
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.
ADB 62.5
Near-obsolete digital lighting control protocol developed by ADB. Uses a 5
pin XLR connector but is NOT compatible with DMX512.
ADDRESS
Each item of equipment controlled by DMX512 has an address, which is the
first DMX control channel to which it will respond. For example, in a
situation where you have three 6-way dimmer racks, the first should be
addressed to 1, the second to 7 and the third to 13.
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