retro fitted headlight is like, frankenstein
basically, it means to mount projectors (commonly from another car, which comes with hid setup from factory such as tsx, s2k, tl, fx, etc etc) onto halogen headlight housing such as 6thgen accord.
with projector, you will have nice and sharp cut-off, preventing blinding oncoming traffic/cars in front of you.
it is only way
I CONSIDER the right way of HID conversion.
search for retro fitted headlight, and you will see PLENTY of results to read.
for example,
http://www.6thgenaccord.com/forums/showthread.php?t=6438&highlight=retro+headlight
above link is simple diy walkthrough.