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Also vibration on the outside wall from door closing can shorten the light. Bulbs these days do not last nearly as long as they should, or so it appears. You can purchase hard duty bulbs for a few dollars more but if they overheat because of over wattage you will be still in the same boat.
We had the same issue on our back door. I purchased a compact fluorescent bulb rated for outdoor use. Its been in two years now and has not burned out yet. The only draw back is when its cold it is not quite as bright until it warms up as We would like when we first turn it on.