Abstract: The present invention converts a D2 burner to a D1S bulb assembly by reducing the size of the transformer and providing a configuration for releasably attaching the D2 device to the D1S-sized assembly for ready insertion and removal of the D2 burner.

Abstract: The present invention converts a D2 burner to a D1S bulb by reducing the size of the transformer and providing springs to couple the arc tube to the igniter, potting the circuitry, and evacuating the air from the circuitry. A spring may be used to couple the burner to the igniter.

Abstract: An operating circuit for a gas discharge lamp includes a rectifier to be connected to an AC power line for generating positive and negative DC voltages, a first inverter connected to the rectifier for converting the DC voltages into a first substantially square wave AC signal, a series resonator for connecting the first inverter with a first lamp electrode, and a second inverter connected to the rectifier for converting the DC voltages into a second substantially square wave AC signal. The second inverter is to be connected to a second lamp electrode. The first and second substantially square wave AC signals have substantially equal fundamental frequencies and are out of phase.