Just for info...
Most cars do not have a HID high beam, this is because of the cycling of the lights, HID have a certain strike time, so will take 20-30 seconds to get to full brightness. This is not the main reason though, its because the life of the lamps are linked to the number of times they are switched on and off and also the way they are switched on and off.
HID lights have no filament (its a high voltage arc across a gaseous bubble) so dont suffer with bumps and vibrations like the halogen lights do, with their thin filament wire bouncing around over each bump, so in theory the low beam HID on a car or bike, should last the life of the vehicle as low beams are usually switched on and left on for the entire journey (and they would stay on while high beam is in use)
some cars do have HID high beams, but they are often done using the same lamp, so its already on and working, some use a mechanical action within the lamp that moves the light source within the headlight unit giving a different beam. usually the headlight unit is also motorised so can adjust the beam angle higher. Not sure in the US but in the UK and i think europe, all OE HID cars have to have motorised headlights that auot adjust their level, you will never find a manual adjuster in a HID equipped car.
All this is nonsense i know, and i cant even remember my point now!
Personally if i go HID on the hayabusa, i would put in low beam and leave high beam as halogen, or alternatively get a switching HID lamp and alter the wiring so the projector does low and high beam with the top headlight offering just an added halogen.
ust a thought.
Andy.