It's impossible to say without a description of the bulbs and the light they
emit. They could be metal vapour lights like Sodium, Cadmium or Mercury,
but they could also be HID lamps.

Dave



Huh? HID is a broad category which covers high pressure sodium, mercury
vapor and metal halide lamps. There's no such thing as a cadmium vapor
lamp, at least not outside of specialized lab uses.

Either way, all HID lamps operate in a similar manner and the ballasts
are also very similar (though their characteristics must be a proper
match for the lamp.)