Abstract
This chapter discusses studio lighting and control. The variable impedance in series with the lamp is called a lamp dimmer. It may be a variable inductance or an electronic device. In the former case, the control of the variable element is by a servo-controlled electric motor. The potential from the fader provides the reference input for setting the required brightness. The arrangement of a master cut switch and fader controlling the overall voltage to a much larger group of individual lamp controlling switches and faders constitutes a playback panel. Normally, at least two such playbacks will be provided in which case they will be labeled A and B or just AB playbacks. A variant is for the A to become a master and B a preset playback. By programming the counter with an existing stored level of selected lamp brightness, the subsequent readjustment of the level becomes merely an adjust-of-count operation by means of the up/down impulses. These are generated by a suitably proportioned thumbwheel, which performs the function of the original fader/potentiometer in adjusting the lamp brightness. It is deeply embedded within the lighting control panel itself so that a segment of the perimeter protrudes. Manual fading uses an 8 bit parallel multiplier. This is generally a static version because of the speed of operation required with lighting control processing.
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