Super Bright HID Xenon Low Beam Headlight Replacement Bulb - by Kensun - (Pack of one bulb) - - D4S - 10000K Important: This product is only compatible with cars with an HID system already installed. Otherwise a conversion kit is necessary. Simple installation - Usually in 20 minutes or less (some vehicles may require a professional installation) 100% Water-proof, 100% Dust-proof, 100% Shock-proof Produces 2 to 3 times as much light as a halogen bulb Superb night-time visibility