T numbers refer to how many 8ths of an inch a fluorescent lamp is. A T5 is 5/8" in diameter. A T6 is 6/8" or 3/4". The same goes for T8, T10, or T12.
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printthread.php?t=5099&pp=40T numbers refer to how many 8ths of an inch a fluorescent lamp is. A T5 is 5/8" in diameter. A T6 is 6/8" or 3/4". The same goes for T8, T10, or T12.