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T8 refers to those types of straight aquarium fluorescent lighting tubes which are eight - eighths of an inch (2.54 cm) in diameter and use a G13 bipin socket.

These tubes are typically being replaced by more efficient and brighter tubes like the T5.

  • You require a specific ballast unit to drive T8 tubes. You can not use a T5 ballast.
  • Metric version is called T26