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I have purchased all the top brands, Sylvania, GE, etc. I have found that the Sylvania lamps have been burning out faster than the rest. That is not to say they are worse than the others. I am sure that for every one I find having been installed "upside down" and burned out there have been a thousand installed the same way working just fine. My information is anecdotal the same as yours. I have bought CFL's for schools and they liked them fine. Some didn't, and returned them because they weren't worth the trouble of replacing every two or three months. I can't begin to explain why some burnup prematurely.
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