what does this "T" mean? What is the difference between T5 and T4?

Date:25-02-2019

Commonly used are T8, T5, T4 lamps, commonly used in th […]

Commonly used are T8, T5, T4 lamps, commonly used in the first two years are T10, T12. So, what does this "T" mean? What is the difference between T5 and T4?

"T", which stands for "Tube", means that this thing is tubular.
The remaining numbers correspond to the following:
T12 diameter 38.1 mm
T10 diameter 31.8 mm
T8 diameter 25.4 mm
T5 diameter 16 mm
T4 diameter 12.7 mm
T3.5 diameter 11.1 mm
T2 diameter 6.4 mm

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