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B
IRDIE
A compact low voltage display luminair containing a Par 16 or MR16 lamp. So
called because it is similar to, but much smaller than, the Parcan, and is
hence "one under Par". (It's a golfing reference). Requires a 12 Volt
external transformer, but is ideal for concealing in pieces of set or as
downstage uplights.
BLACK HOLE
Accidentally unlit portion of the stage.
BLACKOUT / BO / B.O.
Complete absence of stage lighting. Blue working lights backstage should
remain on and are not usually under the control of the board, except during
a Dead Blackout (DBO), when there is no onstage light. Exit signs and other
emergency lighting must remain on at all times. The act of turning off (or
fading out) stage lighting.
BLACKWRAP
Thin black aluminum product which is used to temporarily mask light coming
out of a luminair's body, or to control spill. A self-adhesive tape version
is also available.
BLEECON
Trade name for a type of low voltage 8 pin connector which is similar to the
audio DIN plug. Used most often for carrying signals from analog lighting
control desks to dimmers or to demux boxes. Originally manufactured by
Belling and Lee, hence BLEEcon (for connector).
BLEED THROUGH
Transformation from a scene downstage of a gauze to another scene upstage,
by slowly crossfading lighting from downstage to upstage. If a gauze is lit
steeply, or from the sides, it will appear solid. If this light is turned
off and light added to the set upstage of it, it will disappear.
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.
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