HID headlamps designed, engineered, manufactured, and certified or type-approved as HID headlamps are legal everywhere. "HID kits" and "projector retrofits", where HID bulbs are installed in headlamps not originally designed to accept them, are unsafe and illegal everywhere.
Yes.
yes is legal
no
Yes.
Depends, HID KITS are not legal anywhere in the US, they violate US DOT law. HID lights that come factory with a proper projector designed with HID in mind (higher end cars; Audi, Mercedes). Practically, if you aim the HID lights down, as to not blind other drivers, its unlikely that a cop will pull you over, as they can't really tell if your lights stock or an addon kit.
No, there are no such things as "hid lights".
The older BMWs do not have HID lights
No, generaly the car lights cums with elargins if we want HID lights we can install...it
Don't. "HID kits" are widely available, but they are (all) illegal and dangerous. The only legitimate/safe/legal HID conversion is to install complete HID headlamp assemblies designed, built, tested, and certified as such. Halogen headlamps mustuse halogen bulbs.
In Washington State, the use of high-intensity discharge (HID) fog lights is generally legal, provided they are properly aimed and meet specific brightness and color requirements. However, HID lights must not exceed 3000 Kelvin in color temperature for fog lights. It's important to ensure that any modifications comply with state laws and regulations regarding vehicle lighting. Always check local ordinances for any additional restrictions.
HID lights are generally illegal, and the name is a clue as to why, These are 'high intensity discharge' lights and they can blind any cars coming toward you. There are conversion kits sold that are supposed to prevent this, but you should be careful retrofitting your car to stay legal.
Yes, HID lights need a ballast.