METAL HALIDE LAMP FOR OPERATION WITH A MERCURY BALLAST

摘要

9 47,712 A metal halide high-intensity discharge lamp for connection to a constant wattage-type ballast including a transformer with a secondary having a capacitor connected in series circuit arrangement therewith. The lamp includes starting aid means including a voltage doubler comprising a diode and two resistors operating in conjunction with the ballast capacitor. The starting aid means further comprises a normally closed heat-responsive switch means operative to prevent voltage stress on the diode after the lamp starts.