What is the difference between T8, T10, and T12 fluorescent tubes?

Answer

'F' is output Watts. 'T' is lamp Dia. in eights of an inch. (T 10 and T 12 are sometimes interchangable on the same ballast. Source(s) Retired Electrical Consultant.
Q&A Related to "What is the difference between T8, T10, and..."
These all refer to different types of fluorescent tube lights. They easily classified based on the diameter of the tube as follows. T12 1.5 inches T8 1 inch T5 0.63 inch T12 lamps
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These four lamps vary in diameter (ranging from 1.5 inches to 0.625 or five-eighths of an inch in diameter). Efficacy is another area which distinguishes one from another. T8 lamps
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These four lamps vary in diameter (ranging from 1.5 inches to 0.625 or five-eighths of an inch in diameter). Efficacy is another area that distinguishes one from another. T8 lamps
http://www.ldpi-inc.com/main-site/technical/lamps....
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