Abstract: An electrical control system controls an electrical load device, particularly an inductive load such as the ballast of a gas discharge lamp which generates a back EMF when power is removed therefrom. The control system includes a first electronic switch for controlling the application of power to and withdrawal of power from the load and a second electronic switch which controls the first electronic switch. The second switch is responsive to a command signal preferably occurring between 90.degree. and 180.degree. of the AC power half wave to turn on and thus switch off the first switch which in turn withdraws power from the load. The circuit remains in this state until a predetermined circuit condition occurs at which point the potentials on the load and the AC power supply are at predetermined levels. The equal potential turns the second switch off, whereupon power is reapplied to the load by the first electronic switch.
Abstract: A light collector includes a light sampler for gathering light and a light receiver for receiving the light gathered by the sampler and for transmitting it to a system such as a light illumination control system. The output of the light collector varies with the intensity of the light gathered by the light sampler and can be increased or decreased for a given gathered light intensity by adjusting the distance between the light sampler and light receiver. Accordingly, if the light collector is used to provide to a light illumination control system the actual light intensity of the area in which light illumination is controlled, the light intensity maintained by the control system can be adjusted by increasing or decreasing the output of the collector. Also, the present invention includes a light gathering device for a light collector. The light gathering device includes a lens having angled portions for gathering light from a broad area.