Are HID lights illegal

Answer 1

HID headlamps designed, engineered, manufactured, and certified or type-approved as HID headlamps are legal. "HID kits" and "projector retrofits" where an HID bulb or an HID projector is installed in a halogen headlamp are not legal (and they're also not safe). This answer applies to virtually every developed country in the world, and large parts of the developing world, including USA, Canada, Mexico, Brazil, Argentina, Australia, New Zealand, all of Continental Europe and Scandinavia and the United Kingdom, Iceland, Japan, Taiwan, the Philippines, Hong Kong, China, Russia, and South Africa.

Many people in many of these places install "HID kits" or "projector retrofits" and get away with it for awhile (they don't get tickets) but that does not mean it's legal and it does not mean it's safe. It's neither of those things.