OK, now I have an opinion
If it were me, I would shoot for around at least 2++ watts of flo. light per gal.
(yes... true...i am really into light

)
I know it is more of an aquariumists loose formula, but for me, it has applied well to vivs too.
That viv is approx. 65 gal. , I would use at least a 4 x 24 watt T5 HO fixture.
Now remember, all 4 lights do not have to be on all day. A few light timers can turn them on and off in sequence so the light can step up to full brightness, like mid-day sun, and then dim down as "dusk" approaches.
I find my frogs respond to the changing light levels.
Exo makes a 24" strip that has 3 sockets. It is not as fancy as a t5 fixture, but it can hold 75 watts of CFL. Something to think about.
Anyway, that's my 2 cents. I hope you do a build thread on it.
Cheers, Todd
PS. the lights you mentioned, Gro Beam, those are LED arn't they?
I think Mod Scott on this forum is using them. Maybe he will see this and chime in, or you could IM him.