This past weekend I blew both low beams on my Phillips X-tremes. I was wiring up my winch and started the Jeep to move it. I had one of the nuts on the positive side of the battery loose, and the subsequent lower power killed the bulbs. (oops!)
I replaced them with Sylvania Ultras. The X-tremes are brighter than the Ultras, and the color temp is less blue with the Phillips.