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Ive seen reference to T8, T12, and T17 lamps. What is the difference?

Lamps Reference seen t12 T8
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Ive seen reference to T8, T12, and T17 lamps. What is the difference?

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The diameter of a lamp is measured in eighths of an inch and expressed as a “T” number, such as T8 (equals 8/8’s or one inch) and T12 (equals 12/8’s or an inch and a half diameter). T17 lamps, while uncommon, are 17/8’s or 2 and an eighth inches in diameter. This designation is given in lamp catalogs and sometimes printed on the lamp itself. For example, one of the most common 4′ lamps is an F40T12/CW. The Bulb EaterĀ® systems come standard with an entry tube fitted for T12 lamps. T8 and T17 entry tubes are also available.

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