What’s the meaning of T in the LED tube light T5 or T8

There are tube T8, T5, T4 specifications including the LED tube light commonly used, a group of three tubes such as the LED tube light used by the enterprise is usually the T5 tubs , the specifications of fluorescent lamps commonly used long ago were T10, T12. LED tube light T5 and T8 and other fluorescent tube are the most fluorescent species we contact with in our daily lives, then do you know the meaning of T5/T8?

In fact, we need to figure out the meaning of T :

“T” is on behalf of “Tube”, indicates tubular , the figures 5 or 8 behind the T is tube diameter . T8 is 8 “T”, a “T” is 1 /8 inch . LED tube light T8 means the diameter of the LED tube is 1 inch.

One inch equals 25.4 mm . Then each “T” is 25.4 ÷ 8 = 3.175mm

the diameter of LED tube light T5 and other tube T5  is (5/8) × 25.4 = 15.875mm

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

Browsing the http://www.ledclan.com to know detailed description about the characters and uses of the LED tube light T5 and T8.

Resource from http://www.lighting-ledlight.com/index.php/whats-the-meaning-of-t-in-the-led-tube-light-t5-or-t8/