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B
BAUD
(Bits per second) Measurement of the speed of electronic communications
protocols. DMX512 operates at 250,000 baud (i.e. 250,000 electronic signal
changes per second).
BC HOLDER
Type of UK domestic lampholder that has largely been replaced by the ES
(Edison Screw) and the GES (Goliath Edison Screw) for general lighting
applications in the theater. Stage lighting equipment uses prefocus lamp
bases. (Most types of Festoon still use BC holders.)
BEAM ANGLE
The angle of the cone of light produced by a lantern. Defined as the angle
within which the lowest intensity in a beam of light from a lantern is not
less than one-tenth of the maximum.
BEAMLIGHT
Flood lantern which uses a parabolic reflector and a low voltage high
intensity lamp to produce an intense near-parallel beam. Also known as a
Beam Projector.
A PARCAN is a special type of beamlight.
BECTU
Broadcasting, Entertainment, Cinematograph and Theater Union. The UK
entertainment technicians union. (US equivalent is IATSE)
BEGINNERS
A call given by the DSM to bring those actors who appear in the first part
of a play to the stage. e.g. "Act One Beginners to the stage, please". The
actors/actresses are then called by name. A similar call is given after the
interval (e.g. "Act Two Beginners to the stage please").
BELTPACK
Part of the communication ("cans") system in a theater, the Beltpack
contains the controls and circuitry to drive the HEADSET worn by crew
members. Each beltpack connects into the headset ring and back to a PSU
(Power Supply Unit) which is powered from the mains.
BETAPACK
Portable 6 way dimmer pack manufactured in the UK by Zero88.
BIFOCAL SPOT
Profile lantern with two sets of shutters, one of which produces a hard
edge, and one a soft edge. Not necessary in zoom profiles, because this
requirement is fulfilled by two lenses.
BINARY
BIT = Binary Digit.
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