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STAGE CABLE
A cable used to connect lighting instruments to circuits or dimmer racks.
Standard stage cable is type SO, 12 gauge, 3 conductor cable. This is
abbreviated as 12/3 SO.
STRIKE
The process by which the scenery and lighting equipment for a show is
permanently disassembled when the tour or production closes.
STROBE CANNON
A type of strobelight mounted in a PAR64 housing. Some strobe cannons, such
as the Diversitronics model, can be remotely controlled via a DMX control
signal.
STROBELIGHT
A special lighting effect which produces multiple rapid bursts of high
intensity light. Strobe lighting is almost always produced by a compact
xenon strobe lamp activated by a power supply and timing circuitry.
Strobelights can be simple low power devices with fixed flash rates, or
sophisticated devices triggered by a lighting control console at specific
intervals.
SCREWBASE CFL
A compact fluorescent lamp with a ballast that has a medium screwbase that
fits into the standard incandescent lamp socket. A screwbase compact
fluorescent lamp may either be modular, in which the lamp and ballast are
separate pieces, or self-ballasted, in which the lamp and ballast are
inseparable. Both types are designed to replace incandescent lamps.
SERVICE LIFE
The total time that passes, including time that a lamp is on and time that
it is off, before the lamp must be replaced.
SHIELDING
Shielding conceals the lamp and controls glare within a zone called the
shielding angle. This is the maximum angle that the eye is raised above
horizontal without seeing the light source beyond the shielding system.
SOLID ANGLE
A measure of that portion of space about a point bounded by a conic surface
whose vertex is at the point. It is defined as the ratio of intercepted
surface area of a sphere centered on that point to the square of the
sphere's radius. It is expressed in steradians.
SPECULAR
A surface from which the reflection is predominantly directional. Specular
surfaces are mirror-like or shiny, as opposed to diffuse.
SPECTRUM
Wavelengths of electromagnetic radiation.
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