Hi Don.
I don't have a firm opinion either way but my 75G. tank is lit by T-5's and doing well. I guess it depends on what you plan to stock.
One thing I did do was to build a rockwall using a light diffuser background for support. This allowed me to raise the rocks up and to put my highest light demanding corals on top. Both my hammer and candycanes are doing well anyways (I don't have "high" light corals). The top of the rock ridge is about 6" from the bulbs.
I have two units with 2 bulbs each:
10,000K
6700K
Actinic
Colourmax (came with the unit-when it's time I'll replace with 10,000 or 6,700)
Here's the T-5's in the canopy
and the tank from a little while ago
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growing marijuana