My first set of T-5 lights was not from this vendor but very similar in design. I thought it was an ok fixture until I upgraded to an ATI fixture.
Compared to that the generic fixture seemed to burn the bulbs much more quickly even though it didn't use them to their full potential as the ATI did with the active cooling system.
I think I still have the link to my old build thread in my signature and you can see the difference in light over the same tank