For additional information, Phillips HID Kits usually contain two HID bulb modules lighting, two each of digital ballasts, rubber grommets and wiring harnesses, mounting system and an installation manual with instructions/haynes repair manuals. Life expectancy of the HID Bulb, under normal circumstances, is around 2,500 hours or a little more, something like 5 years of actual night driving. A piece of advice, use headlights that are comfortable for your eyes and with your driving. It is what you are comfortable with that makes things safer.