As most people know putting HID's in reflector lamps is a big mistake - you will just blind the oncoming traffic and deserve to get abused for it. Projector lamps are better suited but ONLY if the filament position within the projector is identical or within a millimetre or so, if not then your beam is going to be "out of focus" so to speak and the light dispersal will be innacurate which can cause undue glare to oncoming motorists, additionally most projectors have an angled cutoff which rises to the left on right hand drive cars and if the angle is high then your beam will be blinding the vehicles in the left lane (or people on the footpath) you will need to adjust your forward beam lower to compensate resulting in poor forward vision for you, the driver.
I have Morrette headlamps with Valeo Projectors, these were suited for HID Globes as the Arc (Filament) positions were identical which provided a perfect focus, the cutoff angle was too high to the left for my liking as I wanted more forward beam without my lamps shining into the side mirrors of cars travelling to the left of me, the solution was to pull apart the projector unit and modify the cutoff which results in a perfect but long reaching flat beam - the lumen output is fantastic and I have never been flashed by oncoming traffic, furthermore, I rarely ever use my high beam (seperate spotlights).
Some newer cars with standard HID lamps have very high cutoff points and I wonder how they pass australian design rules, you may notice some newer Honda and Chrysler vehicles on the road with these high cutoff HID's, they really P%#S me off when I drive in front of them ...
The photo shows the HID Globe on the left and standard filament globe on the right.