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SECONDARY LIGHTING
Separately powered lighting system for use throughout the building in the event of failure of the primary system. Usually battery powered. Maintained lighting is on all the time, regardless of changes in the stage lighting, and is battery backed-up.
Non-maintained systems only light in the event of power failure or an alarm condition. Secondary lighting systems should be regularly checked by an electrician to ensure they operate correctly.
SELECON
New Zealand-based manufacturer of theater lanterns.
SEMIOTICS
The study of signs - many conventions in lighting design rely on signs (blue must be night-time, red is evil etc.)
SERIES SPLITTER
An adaptor consisting of a plug and two sockets wired in series.
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.
SHIFTER
The common Australian term for AJ's, c-wrenches, spanners etc.
SHINS
The lowest lantern on a lighting boom. Named because of the proximity of sharp parts of the lantern to the flesh of the lower leg. This especially applies to standard dance lighting, when the lanterns are positioned at optimum height to light dancers on the stage floor. When the boom is lighting scenic items or large groups, the lanterns may be higher up the boom and the term will no longer apply.
Also known as SHIN BUSTER. The other lanterns on the boom are known as MIDS and HEADS.
SHORT NOSE
Normally refers to a Short-Nose Parcan - a lighting instrument that uses a normal size PAR lamp, but has been shortened to either make it less obtrusive, or to get a wider beam angle.
SHUTTER
Part of a profile lantern. Metal blade which can be used to shape the edge of the beam. Shutters (normally four) are located in the gate at the center of the lantern. Similar in effect to barndoors on a Fresnel or PC lantern, but a lot more flexible.
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