What to look for on screw in bulbs.
Just to add a little info to the rest of the comments:
3 years ago I installed 18 recessed lights going from a kitchen, down the hallways and into the living room. Every two weeks I would receive a call from the customer that a bulb burned out and everytime it was in a different location. I ran voltage tests to make sure that was ok, checked connections, and if I had any hair I probably would have pulled it out. Never did find anything wrong but the problem persisted. The screw in halogen bulbs were the worst problem as far as pre-mature burn out so I kept two of the burned out bulbs and took them to my electrical contractor. (An old timer). The problem was simple he said! He showed me the pitting at the end of the bulb that makes contact inside the socket. The reason for the pitting he explained was that the small contact on the bulb was bad to begin with. Showing him some of the new bulbs I purchased he showed me that 90% of them were not smooth on the contact solder with either a wisp at the end that protruded out or instead of the contact being round and smooth it was indented. Both problems cause arcing to occur which in turn causes bulbs to fail rapidly. The lighting company that I buy my bulbs at pulled a fresh case from stock and we began to inspect them. (Sylvania brand). What did we find? About 90% of the bulbs were either pitted on the contact or had a wisp sticking off the end of them. I then purchased all the good ones, replaced all the bad ones at my clients house and its been 13 months now and not a single bulb has burned out. My electrician friend says he rubs the ends if needed across emery cloth to knock off any wisp of solder sticking up and if its recessed he takes them back and gets it replaced. I contacted Sylvainia about the problem but they dont seem to care because they refuse to follow up with the problem. Im sure they like to sell bulbs!