An HID ballast supplies the high-voltage surge needed to ignite a xenon HID bulb, then regulates a lower steady current to keep it running at consistent brightness and color temperature. A failing ballast commonly causes a headlight that flickers, dims, takes several seconds to reach full brightness, shifts color, or shuts off intermittently while driving. Browse replacement HID ballasts for cars, trucks, and SUVs to restore steady, reliable output from your xenon headlights.
