This HID Electromagnetic Ballast with long-lasting reliable solution for use with an external semi-parallel ignitor and CDM, CDO, MH, HPI (Plus) and SON lamps. It offers long-lasting reliable solution protected from overheating, better for hot environments than its predecessors, one ignitor SKD578 can trigger all lamps from 35 to 600W system design, minimal watt losses thanks to ortho-cyclic winding process, improved thermal features much cooler ballast, it can also be used in combination with series (superimposed) ignitor.