I was reading through old posts, and found this: http://www.controlbooth.com/forums/lighting/4866-stage-lights-bulbs-2.html Ship said, "This all as opposed to real blow outs where the filament possibly due to a voltage spike while already operating at times will shoot thru the outside wall of the glass in the glass having like a bullet effect worth of hole frozen in it, and the opposing side of the lamp having a puckered like appearance due to the gasses sucked out of the lamp." I have a number of HPL and EHG lamps that failed this last year, and when I pulled them out they all showed outward explosions through small holes, some taking bits of the filament through the envelope. I'm familiar with finger print breaks, but and these didn't look like anyone touched them. I assumed I had purchased a batch of bad lamps, possibly flawed glass, until I saw your post. We have a new building that is bug ridden beyond description - how likely is a voltage spike on a regular basis? Is there a way I can test for this? If I can't prove the problem exists on my own, I'm out of luck. I lost two expensive reflectors to exploding lamps. Real fun. I appreciate the help.