from a law enforcement forumn

"NHTSA has threatened to fine sellers of "HID conversion kits" $10,000 per kit sold. You CANNOT install a HID bulb in a headlight designed for a halogen bulb. There is no way you can control the light output properly and you end up blinding oncoming cars and you cannot see properly yourself. Read the fine print on some of these websites selling them..not legal for on-road use....where else do you use a car? They are an illegal & unsafe install."