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T8 tube diameter is 8 × (1/8) x 25.4 = 25.4 mm

The rest of the numbers correspond as follows:

T12 diameter of 38.1 mm

T10 diameter of 31.8 mm

A T8 diameter of 25.4 mm

T5 diameter 16 mm

T4 diameter of 12.7 mm

The T3.5 diameter 11.1 mm

T2 diameter of 6.4 mm

The lampholders specifications: E27, E40, E14

Installation is divided into bayonet, screw, Bakelite, plastic, metal, ceramic and other materials from the material is divided into usually used lampholders, such as E27 is the most popular energy-saving lamps screw lampholders and with the fluorescent lamps T8 lampholder T5 lamp holder lamp holder often referred to, and the other based on the use of the environment and some the lampholders protection class up to IP68, according to the need to develop appropriate IP protection level lampholder (waterproof) at the time of purchase, usually with The lampholder used the IEC (international Electrotechnical Commission standard) safety certification