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C
CHAIN HOIST
A lifting device comprised of an electric motor and gear/chain drive system.
Chain hoists are commonly used to lift portable trusses into place for
touring concerts and shows.
CHASE
A lighting design term referring to a group of lights which are turned on
and off in a sequence. A chase can be as simple as a single string of lights
flashed sequentially around a sign by a mechanical or electronic switching
device (chaser or chase unit), or by utilizing the chase (or effect)
functions of a computer memory console, a chase can be a complex multi-part
cues affecting large groups of lighting instruments.
CIRCUIT
An electrical circuit. In theatrical lighting terms a circuit usually refers
to the part of a lighting circuit which extends from the dimmer to the
lighting instrument. In permanent installations where this is a fixed
relationship (dimmer-per-circuit) the terms dimmer and circuit are often
used interchangeably.
COLOR BOOMERANG
A levered frame device within a followspot in which allows different color
filters to be introduced into the beam. Standard followspot boomerangs have
space for 6 or 7 different colors to be inserted. During a show individual
or combined frames can be quickly added or dropped from the beam as needed.
COLOR FILTER
Color media placed in front of or within a lighting fixture to alter the
color of the light produced. Filters for conventional fixtures are often
made of a dyed polyester film. Since dyed filters work by absorbing unwanted
colors and passing desired colors, they deteriorate from heat and must be
replaced when they "burn up". Automated fixtures use more permanent dichroic
color filters which are created by vacuum depositing thin films onto heat
resistant glass.
COLOR SCROLLER
A mechanical device usually used as an accessory to a conventional lighting
fixture to remotely change the color of the light produced by the unit. A
color scroll, or gel string, consists of individual color filters taped end
to end to form a long string. Gel strings typically contain between 10 and
32 different colors. The color scroller utilizes a remote controlled
stepping motor, and sensors to be able to correctly position the scroll so
that any individual color is in the beam of light. Scrolls can also usually
be moved continuously from one end to the other at varying speeds.
COLOR TEMPERATURE
The measurement of a the 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.
COMPANY SWITCH
A disconnect or electrical connecting/switching device in a theater or venue
which is traditionally used by a touring company to connect all of its
touring electrical equipment. Portable lighting dimming systems are usually
"tied-into" the company switch.
COMPUTER MEMORY CONSOLE
A lighting console in which cues can be stored and executed electronically.
Computer consoles also employ many show editing and cue building functions
which make the cue writing or programming process easier. Computer consoles
can be divided into three basic types: cue-only type consoles, theatrical
"classic" tracking consoles, and automated fixture control consoles.
CONNECTOR
A plug. A device that allows the fast, safe, and convenient connection and
disconnection of electrical equipment. There are many types of connectors
used for entertainment lighting purposes. Some common types include Camlock
for feeder cable and dimming racks, pin connector for stage cable, and XLR
connector for control cable.
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