William L. Brosius - Brentwood TN Robert P. Boydston - Madison AL Daniel Soule - Harlingen TX Candler A. Willis - Zirconia NC
Assignee:
MagneTek Corp. - Huntsville AL
International Classification:
H05B 3700
US Classification:
315250
Abstract:
A combination electronic ballast designed to operate a metal halide lamp and a high-pressure sodium gas discharge lamp is disclosed. The ballast includes a primary and secondary coil coupled to a magnetic core. The primary is adapted to be connected to an ac power source and the secondary is adapted to be connected to a metal halide lamp and a high-pressure sodium lamp. The primary and secondary coils are connected together using a capacitance circuit including two capacitors and a switch. The capacitance circuit is designed to connect both of the capacitors between the primary and secondary coil when a high pressure sodium lamp is connected to the ballast and to connect only one of the capacitors in parallel when a metal halide lamp is connected to the ballast. In an alternative embodiment, the primary is adapted to be connected to one of four different ac power sources.
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