Dimming system for electric discharge lamps.

摘要

A lighting installation having at least one lamp unit (15) designed to incorporate one or more fluorescent electric discharge lamps (19) operable from an a. c. supply is associated with a remotely controllable device Fig. 1 for dimming the lamp or lamps, the device comprising a signal responsive means (3) responsive to signals superimposed on the a. c. mains supply to the lamp or lamps for controlling the light output thereof, and a remotely positioned control device (C) for generating said signals. A plurality of controllable devices may be controlled independently by a single control device, such that different parts of a room or building may be differently illuminated.