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From The Aquarium Wiki

T5 refers to those types of straight aquarium fluorescent lighting tubes which are five eighths of an inch (1.587cm) in diameter and use a G5 bipin socket.

These tubes are typically more efficient and brighter than T8 tubes.

• You require a specific ballast unit to drive T5 tubes. You can not use a T8 ballast.

• Metric version is called T16

[edit] Links

• T5 on Wikipedia