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INSTRUMENT
(US) Same as a LANTERN or LUMINAIR in the UK/Europe.
INTELLABEAM (TM)
A moving mirror type automated fixture introduced by High End Systems/Lightwave Research in the late 1980's.
INTELLIGENT LIGHT
Any fixture whose function can be controlled from a remote location.
INTERNALLY WIRED BAR (IWB)
A Scaffolding bar (aluminium) which has a number of sockets (usually 15A) positioned along its length, the wiring for which is contained within the bar.
IR FILTER
A device for changing, by transmission or reflection, the magnitude or spectral composition of the flux of IR incident upon it.
IRIS
- A device commonly used in an ERS or followspot to reduce the apparent diameter of the beam of light. Many automated fixtures also employ a motor controlled iris which can be used to remotely adjust the beam diameter.
- Adjustable aperture which, when placed in the gate of a profile lantern, varies the size of a beam of light. Originally, iris diaphragm. Most followspots have an iris permanently installed.
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