It's not the bulbs, it's the headlight itself. If you have the regular old round or square standard headlights that you can get at Wal-Mart, then Sylvania makes a true HID replacement system that includes headlight lens, HID bulb and the electrical equipment needed to run it. HID bulbs do not have a filament. They are more like a flourescent bulb - they use a high voltage system that causes an arc. They take a little while to get up to full intensity. Installing an HID system is not a bulb swap, it's a replacement for the entire headlight system. It isn't cheap, either.