B
BLEEDING
Dimmers which are incorrectly trimmed are said to bleed. That is, the dimmer still gives a small output, causing the lantern to glow, when the control signal is at a minimum.
BLIND PLOTTING
The facility on some lighting control desks for the operator to make changes to the plot, without affecting the state on stage.
BLINDERS
Lamps arranged around the stage directed into the auditorium, originally to prevent spectators seeing the stage during scene changes when the house tabs were not lowered. Now used for effect in rock concerts etc.
BLONDE
2000W open-faced flood lamp used in film / TV lighting. So-called because of it's yellow/gold paint finish.
BLUES
Blue lights used backstage in a performance situation.
BNC / BAYONET NEILL CONSULMAN
Coaxial connector used for carrying a composite video signal or radio frequency signal. BNC is also thought to stand for "Bayonet Nut Connector".
BOARD
The main control for the stage lighting. Originally known as the switchboard or dimmerboard, it is now usually remote from the dimmers. The lighting operator for a show is said to be "on the board", and is sometimes known as the "board op".
Known in the US as the Light Board.
BOMB TANK
Metal bin or box covered with fine mesh in which Theatrical Maroons can be safely detonated.
BOOM
- Vertical scaffolding pole (usually 48mm diameter) on which horizontal boom arms can be mounted, carrying lanterns. Often used behind wings for side-lighting etc. Booms have a base plate (known as a TANK TRAP) or stand at the bottom and are tied off to the grid or fly floor at the top (not always necessary for short booms). Booms can also be fixed to the rear of the procenium arch (Pros. Boom) or hanging from the ends of lighting bars. Sometimes known in the US as a light tree. A light tree mounted upstage of a Tormentor is known as a Torm Tree.
- An arm mounted on a microphone stand.
BOOM BASE
A wooden board with vertical scaffold tube adaptor used as a base for lighting booms. Although the base provides a degree of support (especially with added brace weights) booms often require additional support from above.
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