The massive thread posted above probably has the answers I'm looking for. I just ran out of energy and patience to wade through 150 pages of back and forth relevant information.
I've been trying to ascertain what the real issue is with using the OEM projector when converting the headlights from halogen to HID. I've done this to my last two Sierra Denalis without any negative side effects that I can recall.
I am however finding some conflicting points of view with the retrofit to one of the Lexus projectors. I'm not trying to nickel and dime this head light conversion, and if the right thing to do, is to cut open the housings and retrofit the projectors, I'll give that a try. But if there is little to no gain or improvement with the light, then I'd rather spend my time doing something else.
So what is the real reason for this swap/retrofit, and is it worth the time and expense, plus the risk of screwing up a perfectly good housing?