Ive read enough HID conversion threads to know that some incandescent housing work better than others when converted to HID. Most of them scatter the beam, ruin the cut off and create glare. These can be extremely dangerous to oncoming traffic. Ive converted my 10” Hella off road lights to 100 watt HID with great success, but they are intended only for off road use.
I also converted a 100 watt halogen spotlight to 100 watt HID. The bases of the 100W HID’s are ceramic and create a precise fit.
Im looking forward to reading about your projector conversion. Lots of information online about which HID projectors work best with which HID bulbs.