A light bulb burned out within 24 hours of installation. Revain has been replaced with a new package. One of these bulbs was defective (part of the tube did not light up, causing it to be much dimmer than the other identical bulbs in my four bulb fixture). I ordered this particular product primarily to replace two other blown feits. Bulbs that lasted less than four years with moderate use (maybe two hours a day) and I wanted to compete with Feit's surviving bulbs. So, with a sample size of 8, the half-life is maybe 1500 hours. Not good.
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