I did my HID's with Headlamp conversion about 8yrs ago, and it wasn't any better than the stock lighting, in fact it was worse. So this time around I decided to do some real research, and what I came up with is this. Jomax actually touched on it. A projector retrofit w HID's is gonna give the best lighting period, and I wish I had gone this route to begin with. It is a little involved, but the pay off is outstanding. I'm sure there are others out there, but TRS offers these Morimoto kit's as well as the HID kit's. If your looking for a cheap HID kit or a cheap way of doing this, then you don't want to go with TRS. Nothing they offer is the Chinese garbage that people for some reason, seem to gravitate to when doing LED's, HID's & Projectors. Their prices to me are reasonable, but it's the quality of their product that impress's me even more. I just bought and installed an HID kit from them, and it went fairly easy. When you remove the product from the packaging, the first thing that hit's you is the quality of all the component's. Anyhow, here is a link to the company. Check it out for yourself..
I'm not saying that this is the best kit because I bought and installed their kit. I'm merely passing on the info that I came up with after extensive research, and various phone calls, as well as a conversation on another forum of a guy out here in Ca that did a TRS Retro Projector HID kit. If anyone is interested, pm me and I send you this info. He posted up pic's before and after as well as the lighting he now has.
https://www.theretrofitsource.com/