from what i understand, its from the design of the H3C bulb. while they are close to the actual H3 halogen bulbs, they were initially designed for use in scuba gear, to be operated on 25w power, not 35w. so, basically, running them in an automotive environment, you are over powering them, which leads to premature failure. in an automotive application, they will typically only last about a year, unfortunately.
even more unfortunate, is that i am coming up on my one year anniversary on mine.![]()
to swap bulbs, you need to remove the fog housing and remove the 2 swcrews on the back WITHOUT TORQUING OFF THE HEADS!!
Then remove the back and unclip the bulb and replace with HID bulb. You will need to figure a way to get the HID wiring through the back, probably drill a hole to run the wires an dthen fill with silicone or something similiar