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T12 to T8

T12 and T8 refer to diameters of lamp tubes. A T12 lamp has a diameter of twelve eighths of an inch, or 1-1/2 inches and a T8 is eight eighths of an inch, or 1 inch in diameter. Typically a narrower lamp is more energy-efficient so the T8 is a more energy-efficient lighting mechanism than the T12.

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