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In the Entertainment Industry, a light used to indicate a "GO" to an actor and/or technician. Often composed of two sockets wired in parallel so that if one lamp burns out during a run the device isn't disabled. Several cue lights are often controlled via a rack of switches mounted near the stage manager. When the light turns on that is "standby", when the light turns off, that is "go".

Not to be confused with Q-Lite, an open-face TV/film fixture from Altman.
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