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What is T5 T8 and T12 lighting?

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What is T5 T8 and T12 lighting?

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The "T" in T5 indicates the bulb is tubular shaped, while the "5" denotes that it is five eighths of an inch in diameter. The other common lamps are the larger T8 (eight eighths inch = 1") and T12 (twelve eights inch = 1½" tubes).
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