T5 Lighting...

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Its the same as T8, but I think the tubes are smaller in diameter and give out more penetrating power...
 
Well the simple answer is it relates to the thickness of a flourescent tube - T5 is 5/8th of an inch thick (T8 therefore being 8/8ths, i.e. 1 inch)

Much more too it, obviously but here's a good place to start;

What does T5 mean
 

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