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Originally Posted by Philscar
Incandescent light bulbs were designed to fail after x number of hours.See the package.
The glue used to seal the bulb dries at a known rate then cracks and lets air in to destroy the filament.
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Not so. I have a number of incandescent bulbs (in places like closets, where replacing them wouldn't be cost-effective). They were here when I bought this place 15 years ago, and who knows how long before that.
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Florescent bulbs are now produced to do the same.
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Can't speak for current production, as I've not had to buy new CFLs in maybe 5 years. However, I do have several that date back to maybe the early '90s (before the twisty shape became standard), which have been used pretty much every night, and are still going strong.
I almost wish a few would fail, so I'd have an excuse to replace them with LEDs.