I purchased a 250 watt zoomed basking light yesterday. 25 minutes after turning it on the glass dropped right out of the fixture, almost as if it melted. I exchanged it right away and sure enough the next one did the same thing. My buddy at the pet store and I checked out the fixture and it was fine. The freakiest thing was the light stayed on without the glass dome. Had a hard time removing the stub of the bulb and settled on the 100 watt as the othet 250's were from the same lot number. Just curious if anyone else had this problem with the 250 ?