Lumatek Electronic Ballast provides a stable light output and features a fast start-up. It reaches full brightness in under a minute while the magnetic ballasts can take longer. Lumatek Electronic ballast is completely silent and produces less heat than conventional ballasts. This ballast has cut-off circuits and enables a longer life. Lumatek Electronic Ballast has a small compact design - 250 watts 230 volts. This ballast can light both HPS and MH lamps. As well as the dimmable in 4 modes, 150w, 175w, 250w, and the highest is "super lumens" that generates up to 10% extra boost, bulbs we sell that supports this function is off the mark, Phillips Green Power, Lumatek & Gavita .