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The obvious answer is "until the warranty is up". Like any part for anything, failures can happen at any time and there is no established lifetime except, as I said, for the warranty period. If you have replaced the majority of light bulbs with compact flourescents, as I have, you know this fact first hand. The package on some touts an 8-year life. I've only lived in my house 5 years and have replaced many of these bulbs.

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13y ago

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