What is the difference between T8 and T10 bulbs?
The T8, T10 and T12 tubes are mainly difference in the diameter of the tube. The main difference is in sizeā¦the T8 is one inch in diameter and everything else is divisible by that number: T5 = 5/8 inch, T6 = 6/8 inch, T8 = 1 inch, T10 = 1.25 inches (10/8), T12 = 1.5 inches in diameter (12/8). via