T5, T8, and T12 are different models of the fluorescent light tubes typically seen in office buildings and classrooms. The “T” stands for “tubular.” The number following the T indicates diameter size in eighths of an inch. In other words, a T5 fluorescent lamp is a tube with a diameter of ⅝ of an inch. A T8 tube is 8/8 of an inch, or 1 inch.
Which Fluorescent Light is Best for Growing: T5, T8, or T12?
Indoor growers who choose to use fluorescent tubes as grow lights prefer T5 lamps. Compared to the other fluorescent options, T5 tubes are more efficient and available in a range of color temperatures.
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