cheap for a lot, but they burn out pretty quick

We have an indoor hallway fixture that needs six of these, and we are constantly replacing them. We don't spend a lot of time in the hall, but they still seem to burn out pretty quick, sometimes in the space of few weeks, sometimes in the space of a few months. But they're so cheap, what do we expect? We've ordered three or four boxes over the past few years and we get the same quality product every time--four stars because they burn out at strange intervals but also... super cheap price.

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