I believe that T6 is a different connector - more like the old T8 & T12. IIRC, T6 is available as VHO, while T5 is mostly HO, T6VHO would be brighter than T5HO. On the third hand, people overdrive T5, too.
You might want to check out the lighting and equipment forum - there's a lot of T5/T6 stuff over there.
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