Quality HID Conversion Kit Xenon Replacement Slim Ballast Light Bulb 35W This kit contains everything you need to upgrade your existing car's headlight system to the best lighting available today! 2 Digital SLIM HID Ballasts HID (High Intensity Discharge) refers to lighting technology that relies on an electrical charge to ignite xenon gas contained in a sealed bulb HID bulbs are gas filled capsules that are rated for a lifespan of nearly 4500 hours HID lights are currently used in most sports arenas, stadiums, and train stations worldwide