A discharge lamp lighting apparatus, comprises a DC power supply, an
inverter circuit, connected to the DC power supply, and provided with at
least two switching devices, and a discharge lamp energized by the
inverter circuit, wherein one switching device has an on-duty
complementarily different with an on-duty of the other switching device,
and wherein the inverter circuit executes a switching operation in that
the on-duty of the one switching device substitutes with the on-duty of
the other switching device.