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T
T CODE
Lighting Industry Forum code which identifies the (original) recommended usage of different lamp types. T coded lamps are for theatrical use, and have a color temperature of 3000°K.
TAB DRESSING
Lighting focused onto the front tabs to before the show starts.
TAILS
Also known as BARE ENDS, TAILS refers to a cable or set of cables with a connector at only one end which is used for connecting a company's equipment directly to the mains supply in a venue. The connection should only be made by a qualified electrician with the power off!
TALLESCOPE
A retractable alloy vertical ladder on an adjustable wheeled base. The platform at the top is just large enough to hold one person. Used for rigging lanterns, focusing etc. Collapsible enough to fit through a standard doorway. Outriggers are used to stabilise the tower from falling sideways. Two people are used to move and steady the tallescope. Sometimes known as a "TALLEY".
TECHNICAL REHEARSAL
Usually the first time the show is rehearsed in the venue, with lighting, scenery and sound. Costumes are sometimes used where they may cause technical problems (eg Quick changes). Often a very lengthy process. Often abbreviated to the Tech. A DRY TECH is without actors to rehearse the integration of lighting, scenic changes etc. It follows that a WET TECH is a full technical rehearsal with actors and all technical elements, although this term isn't used as often as DRY TECH. A PAPER TECH is a session without the set or actors when the technical and design team talk through the show ensuring everything's going to work as planned. Stage Managers can use this session to ensure all is written correctly in the Prompt Book.
THREE-FER
A circuiting device which allows three lighting instruments to be joined into one cable or circuit.
THROW
Distance between a light source (e.g. lantern or projector) and the actor or object being lit.
THYRISTOR
Also known as an SCR (Silicon Controlled Rectifier). An electronic switch which will pass current when triggered until the current passing through it falls to zero. Essential component of stage lighting dimmers.
TIE-IN
The process of connecting dimmer rack feeder cable to a company switch or power supply.
TIE-IN SET
A set of feeder cables or other necessary connecting devices needed to tie-in a dimmer rack. A standard tie-in set includes a ground, neutral, and three hot cables with bare-ends in one end for connection at the company switch or disconnect panel.
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