In comparison to the ballasts and separated igniter boxes included with other HID Kits, each HID Kit from Sixty61 comes with one of the newest combined ballast and igniter sets on the market. Our single piece ballast and igniter box makes it simple for riders to install a new HID Kit on their custom Motorcycle without having to worry about finding a place hide away both a large ballast and separated igniter box offered with other HID Kits. Our Cruiser HID Kits are designed to fit original stock headlamp sockets without modification, making installation a simple plug and play process. Sometimes installation can be done individually in a matter of minutes. We always recommend a professional installer for performance and safety reasons. ANSWER: Unlike halogen bulbs, HID's emit a type of ligh