I found these bulbs to be of very poor quality. They burn out after a few hours of use. My estimate is maybe less than 48 hours of full use before they burn out. And when they're expired, the glass part of the bottle often breaks when you try to get them out of the nest. I would suspect this is caused by the heat of the oven. It may last longer in an unheated appliance, but not in the oven it was supposedly intended for.
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