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GOBO
Also called a pattern, template, or cookie, a gobo is commonly an etched steel cut-out placed at the gate of an ERS which produces a pattern of light and shadow in the beam of light. Patterns are commercially available from theatrical lighting dealers or can be made by hand using a number of different processes. Many automated fixtures employ a variety of gobos and gobo effects. These include rotatable gobos, gobo combinations, glass colored gobos, or even sophisticated imaging systems which combine dichroic color effects with patterns or custom designs or artwork.
GOBO HOLDER
A metal plate designed to hold a gobo of a particular size in a lantern of a particular type.
GOING DARK.
Warning to people on stage that the lights are about to be switched off. Normally said during lighting plotting sessions or technical rehearsals.
GRELCO
Brand name for a 2 way 5A or 15A electrical splitter. Another name is SNAPPER (another brand name) or in the US "TWOFER". Sometimes shortened to GRELLY. A three way splitter is known as a TRELLY (or THREEFER in the US).
These splitters are always wired parallel (voltage equal, current shared).
GROUND PLAN
Scaled plan showing the exact position (seen from above) of all items standing on the stage floor and indicating the position of items suspended above. Typical scales are 1:24 (.5" to 1 foot) or, metrically 1:25 (1cm to .25m). Venues have a base plan showing proscenium, walls, seating etc on which individual set and lighting plans can be drawn.
GROUNDROW
1) A long piece of scenery positioned at the base of a backcloth usually to mask the very bottom of a cloth or lanterns lighting a cloth.
2) Compartmentalised floodlight battens at floor level used to light the bottom of skycloths etc.
GROUP
A subdivision, permanent or optional, of a lighting board control preset, or a sound desk.
GROUP RELAMPING
Group relamping entails replacing all of the lamps in a system together after a fixed interval, called the economic group relamping interval. Group relamping can reduce the cost of operating a lighting system while keeping illuminance levels close to the design value.
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