SYLVANIA D1S High Intensity Discharge (HID) Bulb, (Pack of 1)SYLVANIA High Intensity Discharge (HID) Lamps use less energy than halogen lighting, while producing 3 times more light and less heat. HID lighting is light from a plasma discharge rather than a filament creating a distinctive blue white look in your vehicle. See Sylvania's Automotive Bulb Replacement Guide to confirm compatibility HID lighting is light from a plasma discharge rather than a filament HID uses less energy than halogen lighting, while