http://www.reptileuvinfo.com/docs/ul...amphibians.pdf
I think you should read this. This is very informative with serveral professional opinions on various questions regarding lighting on mamals, reptiles, amphibians. Mostly, there is not enough sufficient scientific research on reptiles and amphibians, but this article definitely will shed some light on the subject.
I think you should be fine. Just make sure there are some places for your froggy to get shade. In my personal opinion I think that the frogs should have some sort of lighting for photoperiod, but shouldnt be directly exposed to it for long periods of time. Tall canopy plants and log hides would be perfect for filtering flourescent lights.
I think your setup is good, but it may need to grow a little more to get some canopy.