Well,,, Duh,,,,You shouldn't even touch the bulb with your bare hands. The oil on your fingers can cause a hot spot which will cause the glass envelope to fail. HID bulbs are all prone to this, some more than others.It depends on the surface temp.of the glass. Be careful out there!Your bulb will blow if you get it wet while hot via spray bottle.
Try a hardware store,Home Depot,etc...any where that does commercial windows..But where did you get your tempered glass in the first place?
That's the ticket!!Yeah, Home Depot and Lowes didn't have it. I found 9'' x 14'' Tempered for $18 at a local glass shop. Able to withstand 450 Degrees F.