Two Lumenarcs over a 6-foot tank?

[Delphinus]

Maybe you want to think about the Lumenarc Mini's - supposedly just as good, but with a much smaller footprint. Then you'd have space for the T5's..

[Jason McK]

I have 3 over a 6 foot tank. I used the Luminarc III not the minis. But my tank is 3 feet wide. You might want to consider 3 of the minis and you woul still have room for T5.
BTW I run 4 X 2T5 retro kits even with the Luminarc IIIs