yes, one low and one high. What causes the glare if I were to put an HID in it? Is it just the specific design of the reflector? Is there any way to change this?
To get technical, there are parts of the reflector designed to reflect only a certain amount of light to certain places. One good example would be the "squirrel finders" which are small amounts of light ABOVE what would be the cutoff that serve to help street signs on overpasses etc glow. When you triple the brightness of the bulb, you triple the brightness of all areas of the reflector, including those typically only meant to reflect small amounts of light... which blinds people. Not to mention, all the excess light that typically bounces around and "bleeds out" is now amplified three fold as well, causing even more glare.
Some reflectors are fine with xenon bulbs, but they are designed for them (2nd generation Acura TLs and CLs are great examples of this as their reflectors are actually really good.)
Some people swear that aiming them lower will reduce glare, but what is the point? Aren't you trying to get MORE light on the road, and not just a higher concentration? Projectors are designed so that they more efficiently disperse the light, which keeps contrast down. High concentrations of light will cause a major contrast to the dark areas that remain unlit and your eyes will become adjusted to the light making darker areas darker.
Now, the real debate that most with fight is whether or not glare on a bike even matters. Why go through the trouble to make it less obnoxious to surrounding drivers when most are doing all they can to be seen? Hell, most drive with their high beam on 24/7. You decide.