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I

I.A.T.S.E. (INTERNATIONAL ALLIANCE OF THEATRICAL AND STAGE EMPLOYEES)
A union representing professional craftspeople in the entertainment industry. This union includes stage electricians, carpenters, and projectionists. A venue is a union house if its local crew belongs to IATSE.

ICON ^(TM)
A moving yoke type automated fixture distributed by Lighting and Sound Design (LSD).

ICS / INTEGRATED CIRCUITS
The building blocks of electronics, usually black with loads of silver legs.

IEC / I.E.C.
International Electrotechnical Commission. The UK mains inlet connector / "kettle lead" is known as an IEC LEAD.

IESNA
Illuminating Engineering Society of North America.

IGNITOR
A device, either by itself or in association with other components, that generates voltage pulses to start discharge lamps without preheating of electrodes.

IMPEDANCE
A term for the electrical resistance found in a/c circuits. Affects the ability of a cable to transmit low level (e.g. sound) signals over a long distance. Measured in Ohms. Speakers are rated according to power handling capabilities (Watts, W) and impedance (Ohms).

INCANDESCENCE
The self-emission of radiant energy in the visible spectrum due to the thermal excitation of atoms or molecules.

INCANDESCENT
Light source consisting of a metal filament (Tungsten) which glows white hot when current is passed through.