By all means, using the correct housing is the best route.
HID bulbs as said before "Throw" light in all directions, including up. So by aiming the housing down a bit, it eliminates some of the light being "thrown" upwards.
I've read on this forum about bulbs called HIR's being pretty much the best bulb you can use in the stock housing.
So normal halogen bulbs DON'T throw light in all directions? Why there would be any difference between the direction the light will shine when comparing a Halogen bulb vs a HID bulb. HID's just shine brighter, but still in the same direction.
If I am correct in my assumption, headlights are parabolic shaped which focus the light from the bulbs so it shines forward. Why would it be any different on HID's?
Now if you are lifted, that's a different story. Your lights are 2-4' higher off the ground and instead of shining on someone's bumper, you may be pointing your lights right on the back window of a small car.
p.s. - I have driven behind my friends cars at night many times and no one has ever complained that my lights were too bright/blinding them.
2009 3.7L Laredo Black | Two-Toned Leather | RER Nav/DVD/BA System | Viper alarm | HID's in the lows and fogs | Westin Brush Guard | Tinted Tails | Custom Blue LED Interior/Rear Hatch Lights - White Rock Lights| Rough Country 1.5" Spacers | General Grabber 255/70r17 -- Island Beach State Park 4x4 Mobile Sportsfishing Permit --