They are not legal. It's been covered tons of times. For them to be legal, they need to be type tested, be auto levelling & also needs to have windscreen washers.Only headlights fitted at the factory are type tested (or genuine OEM parts).
The HID lights are designed with specific reflectors which are not in the standard lights. Also, projectors don;t mean that you can upgrade to HIDS cos of the reasons above. A lot of projector lights are still designed for a halogen beam pattern.
Basically the rheostat mod is illegal, putting HIDS in a standard lamp are illegal, any headlight kit that has an option to upgrade to HID's (FK) is illegal.
Seriously, putting better bulbs in a standard light is the best idea (along with checking you get enough voltage to the lights in the first place!!!!)
I just wish the police would fine everyone who had these kits. They are so dangerous to oncoming drivers it is untrue.
All this HID discussion is futile anyways. In a couple of years, LED's will replace Halogen & HID's, so we will have this discussion all over again!
Wanted - Bora Longbeach or Sanata Monica 17" Alloys for refurb