I received this bulb and measured the circumference of the tube to be 6.1 cm (2.4 inches). Divide by pi to get a diameter of 0.764 inches. To convert to T (eighths of an inch), divide by 0.125 = 6.112 inches, T6, not close to T5, which would be 5 cm in circumference. Fits my lamp, I can confirm my previous statement that this lamp is NOT a T5 but a T6.
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