... electronic ballast(35w 12/24v),hid electronic ballast,lighting ballastWe are professional HID manufacturer and have done HID export for several years.Therefore ... lates series of All-Digital Intellectual Ballast(35w,50w,55w),for these bulbs:H1,H3,H4,H4(H/L),H7,H8 ... is waterproof and shockproof,the guaranty year is three,one for replacement,the other two years ...