The optics in these headlights were not engineered for HID lighting, like the ones in the 01-03 Acura CL or TL which came with HID low beams from the factory. Putting HID kits in headlights that were not engineered for them results in scattered and uneven light output that is not well controlled due to the "reflector buckets" that are reflecting the light from the bulb out onto the road. However, certain cars handle this better than others...6GA is somewhere in the middle maybe IF it is using factory headlight housings. Aftermarket headlight housings have even worse optics than factory, usually.
For low beams you can get away with it since it is lighting up the environment immediately in front of you, and since low beams are aimed downward. But with high beams being for illuminating objects further out and higher up, an HID kit is useless and a hot mess. Also since high beam buckets are aimed higher to achieve their purpose, an HID kit in high beam reflector bucket optics is going to be blinding oncoming traffic like crazy in a 6GA.
Projector retrofit headlights are factory reflector bucket style headlights that someone has taken apart, cut up, and modified to mount projects inside of. I went from stock 6GA headlights with an HID kit to a TSX retrofit I bought off an old member on here, difference was literally night and day. Still running them to this day, actually.