The HID bulbs are longer than normal bulbs thus reflecting light at improper angles off of non-HID lense reflectors/refractors...
This is what causes oncoming traffic to hate you, bright light you when your brights aren't on, and swerve at you hoping to scare you into a ditch and burst into flames...
Or maybe that's just me?
If you are going to spend the money on the "conversion" make it a complete conversion and get the actual, working projectors for HID bulbs (not knock offs) a couple of grand later you too can have pretty blue, pink, purple, or laser white lights.
Not trying to flame here (God knows I've done enough $hit to my rig that most wouldn't approve of) but I am unfortunately stationed in Cali right now and it seems like everyone has this done in the cheapest route possible. These are the same people that drive with their fog lights on all the time, in the desert, where it is foggy about twice a year.
Wow, it's just after 0730 and I already got a rant outta the way for the day! Going to be a good Monday