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S
SPIDER
A circuiting device that allows multiple lighting instruments to be combined into a single circuit or cable.
SPIGOT
An adaptor screwed onto the hanging bolt of an instrument to enable it to be used on an upright stand.
SPILL
Unwanted light onstage.
SPILL RINGS
Concentric rings attached to the front of a beamlight (eg Strand Pageant) to contain spill.
SPOT
To reduce the beam size of a fresnel or pc lantern by moving the lamp further from the lens. (e.g. "Could you spot that down a touch, please?").
SPOT SEAT
Chair for suspending followspot operator above a stage / auditorium. Normally rigged on a truss system. The operator gets to the seat up a wire rope ladder, and is strapped into the seat. He or she will normally wear a harness when getting to the chair for extra safety. The seat itself is an adapted car "bucket" seat.
SPOTLIGHT
General term for any lantern with a lens system.
SPREAD LENS
A glass lens accessory used to diffuse and widen beam patterns.
SSOUND TO LIGHT
A facility which can link the effects panel on a lighting board to an audio input which detects treble, mid and bass beats, and can flash lights or trigger effects in time to those beats. First used when electronics allowed it cheaply in the late 1960's/
STAGE BOX
A connection box at the end of a lighting or sound multicore cable.
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