HIDs are cooler than Halogens.
I have 2 cars with Xenons and both of them have different setup.
On 1 car the which is an older system, the high beam is separated from the main Xenon bulb. On the other (most of them going to Bi-Xenons) meaning they both use low and high beam on the same bulb.
All cars that came with xenon as standard (for my cars anyway) DO have self cleaning system and self leveling.
I will be getting another vehicle soon and will let you all know on the latest xenon setup which follows the direction of the car.
Oh, once on a xenon, I will never go back to Halogens.
Munich
PS: You can PM me to find out more about xenons