Hmmm. We have a lot of recessed light cans in the ceiling and outside, and the ones that are sealed -- the ones that have some sort of lens over the bulb -- burn out a lot more quickly -- like, in a couple of months. I thought it was something to do with the wiring, but it turns out that bulbs in sealed fixtures get hotter (of course) and burn out more quickly. I bought some bulbs that are supposed to last 3x longer than regular bulbs, and they did; they lasted six months! Which is way below their standard rating.
You say that these are pendant fixtures: are the bulbs bare, or are they enclosed? From my experience, anything that traps heat around the bulb with little or no air circulation will reduce bulb life.
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