The only potential issue with dropping an HID bulb into the stock OEM projector is it can create hot spots.
(although it is a projector, it was designed to run a halogen bulb)
The factory projector lens is not optically clear and has a slight purple tint.
Perhaps it's not an issue with the stock chrome shroud units,
but the custom painted ones, like the ones I have, are taking a chance...even at just 35w.
Ask me how I know.... it doesn't happen often but it is a risk.
Drivers side hot spot blistered paint in lower inside corner, GRRRR!!
JJ said he'll fix it for me, or sell them as is at a discounted price.
(can't be seen from more than 2' away, but I'm a bit OCD about things being perfect)
35W/5000k
Passenger side has the same hot spot location but barely noticeable (so far)
So now you guys with 55's no where to look,
if there's going be an issue that's the most likely location.
It's never happened on an FX-R retro'd set,
So far just the combo of painted shroud, OEM PJ, drop in HID bulb
I have no doubt it would have been much worse with 55w HID's
My new set are getting FX-R'd just to be sure it doesn't happen again.
For anyone thinking of custom paint it only makes sense to upgrade the PJ since it's opened for paint