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What are T-8, T-10 and T-12 fluorescent tubes?

April 26, 2017fluorescent T-10 T-12 T-8 tubes

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What are T-8, T-10 and T-12 fluorescent tubes?

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The numbers designate different diameters of fluorescent tubes. T-8 is 1″ in diameter. Found in newer commercial fixtures. Uses electronic ballast only. Fixtures with T-8s generally have 3 tubes per fixture. T-10 is 1¼” in diameter. Uses an electronic or magnetic ballast. T-12 is 1½” in diameter. The standard-size older tube. Uses electronic or magnetic ballast.