Abstract: In a lighting installation comprising light sources each connected to an A.C. supply system, a control device including: power variation circuits connected to the different sources and each comprising means for varying the electrical power supplied to the respective source, in response to magnitude variations of an electrical quantity, and control circuits associated to the different sources and each comprising a clock circuit, an illuminating programme circuit in which is recorded a programme representing desired timed variations of the illuminating power for a given period, a selection circuit receiving clock pulses from the clock circuit and connected to the programme circuit for selecting an illuminating power dependent on the elapsed time from the beginning of said period, and an output circuit for converting said selected power to a particular magnitude of said electrical quantity.

Abstract: A main control device comprises a plurality of lighting-control signal generators for generating lighting-control signals whose contents can be analogously varied, and a keyboard for specifying the contents of mode signals corresponding to those of the lighting-control signals. The lighting-control signals are supplied to the terminal control devices through a signal line. Mode signals and address signals are supplied to the terminal control devices through the signal lines. A terminal control device selected by the address signal selects a lighting-control signal corresponding to a mode signal. The selected lighting-control signal controls the lighting of a lighting load by phase control.

Abstract: A keyboard operated controller for controlling a plurality of lighting devices has a memory which includes a plurality of addressed multiposition registers wherein the positions store control indicia for the respective lighting devices. A finger-operated keyboard generates addresses which select the registers to control the states of the lighting devices. There is also provided means for loading the control indicia into the registers via another keyboard.

Abstract: A keyboard operated controller for controlling a plurality of lighting devices has a memory which includes a plurality of addressed multiposition registers wherein the positions store control indicia for the respective lighting devices. A finger-operated keyboard generates addresses which select the registers to control the states of the lighting devices. There is also provided means for loading the control indicia into the registers via another keyboard.

Abstract: An improved solid state electronic dimmer circuit for controlling the intensity of large electric lamps, such as theater and television lamps, in response to a low power DC control signal. The transfer characteristic of the circuit is determined by the properties of a generated precision waveform having a predetermined shape and amplitude and a fixed phase relationship to the power line voltage which, in conjunction with the DC control signal, determines the effective voltage at the output of a dimmer unit. The same precision waveform may be used to control a plurality of dimmer channels, thereby making possible precise matching of performance of all commonly controlled channels, and effecting significant savings in the cost of manufacture.

Abstract: A controlled dimmer lighting system suitable for television studios, remote television pickups and stage lighting employs small, solid state dimmer circuits of the SCR-type on a dimmer per lamp basis. Each dimmer and its associated series-connected lamp is directly connected to a respective power outlet, and a preselected group of the dimmers is controlled in unison by a common time-variable pulse generator for firing the SCRs. The common pulse generator is mounted in a lighting control console, and pulse signals for controlling the dimmers are coupled by miniature coaxial signal cables to the dimmers of the preselected group. The system eliminates the power patch panels and dimmer room required in current studio lighting systems and achieves a simplification in grid outlet wiring, resulting in a significant reduction in size and cost as compared to available studio lighting systems.

Abstract: A sequential light flashing circuit usable as a decorative display for Christmas decorations or the like includes a switching circuit for energizing lights in a predetermined sequence to provide a variety of distinct light patterns. A thyristor brightness control circuit is employed in conjunction with the sequential switching circuit to vary the brightness of each light during its operating interval. The operation of the sequential switching circuit may be stopped at any desired point to permit any light pattern in the sequence to be continuously displayed.