[mx3twinturbo]

Originally Posted by FattyBoomBatty

I need to question this method of measurement. Did you use an optical temp sensor, like infrared stuff? If so, this can't possible represent the actual temperature of the surface, you could just as well be measuring the temp of the filament in the incandescants, and the gas or whatever it is in the HID's. You need a non-optical reading for surface temps of glass.

My guess is that it will be very different (lower for both). If my headlights are reaching 900 degrees, my car would have caught fire a long time ago.

And it was already addressed, but I would think poor wiring would be the culprit, not the bulbs or ballasts themselves.

agreed to the point of accuracy, just to prove the point that the HID bulbs run cooler,