A transformer for a lamp system. A first spindle comprises a first hollow
portion. A second spindle comprises a second hollow portion and is
arranged in parallel with the first spindle. A first coil is wound around
the first spindle. Second coils are wound around the second spindle. The
number of second coils is even. Windings of the second coils are
approximately equal. The core module is disposed in the first and second
hollow portions.