Or, properly aim your housings. I bought a headlight adjustment tool when I installed mine, and parked my Camaro on the side of the road so when I was done aiming the lights against the garage door I would park in the street and hop into the Camaro to see if they were too bright. 1997/98 Lincoln MKVIIIs were available with factory HIDs, as were 2003-2005 Town Cars, and early 00's Lexus LS400/430s just to name a few. None of these cars had projector housings. Not as effective as projectors, but it is still possible.

Edit: Im still doing a retrofit in my spare headlights, but there are ways to having HIDs in incandescent housings without being a complete fucktard.