Patent ID: 7109668

Claim:
A lighting apparatus comprising: an electronic lighting ballast enclosure; a power factor correction (PFC) circuit installed in the enclosure and having a switching power supply circuit to provide a DC voltage from a lamp input; an inverter installed in the enclosure and having a) an input coupled to an output of the PFC circuit, and b) an output to be coupled to a lamp load; and a programmable microprocessor installed in the enclosure and coupled to control the inverter so that a plurality of different types of lamp loads can be alternatively driven by said output, the different lamp types including high pressure sodium, metal halide, and mercury vapor lamps, where each one of said different lamp types can be driven at a plurality of different lamp input voltages, and wherein the microprocessor is programmed to further control the inverter so that various manufacture-type lamps of various wattages can be driven at said plurality of different lamp input voltages.