1. 400w HID electronic ballast, 2. compatible with MH ... giving you consistent color rendering. The HID electronic ballast offers one of the best warranties on ... electronic ballast wil turn on MH and HPS lamps.We also supply 250w, 600w, 1000w ballast. MODELElectronic Ballast 400WLAMPPHILIPS, OSRAM, GE, SYLVANIA 400W ... POWER FLUCTUATE NOT MORE THAN 10W.** THE BALLAST WILL PROTECT ITSELF IF NO LAMP, SHORT ...