It's been a couple years since I've done any lighting, so I was a bit rusty. But I spent 2.5 days trouble shooting, repairing, and doing lamp replacing. Job had a few problems, mainly too high of voltage at the fixtures. This was causing lamps to fail quickly. Then of course the home owner wasn't replacing all of them, and the new ones were very high voltage, getting hot, melting the cans and grates on top. So, after replacing the lamps, and getting the proper voltage (Unique 840w transformers), there was still a problem. The homeowner had purchased some replacement lamps for the PAR 36s from a local light bulb/lamp company. they had to order them for her as they don't carry in stock, and she couldn't find anywhere else. Well the brand was DAMAR, 25w PAR 36. I had the voltage at about 11.0-11.4 on most lamps as I was still working and troubleshooting. I heard a "POP" and went and looked around. The glass front completely popped off, basically cracking around the outer edge and then it flew off about 5'. This ended up happening to 4 of them. I eventually replaced all her DAMAR lamps just out of safety (or fear!). I assume it was getting too hot, but the voltage wasn't outrageous by any means. So any reason why this would happen? Outdoor temps were cool, but not sub-zero or anything. Not that that should matter anyway. I have some PAR36s at my place that have been in over 5 years. Is it the manufacturer?