I just setup my 5.5g shrimp tank reasonly and end up buying this light.
Finnex Aquarium Nano Refugium Cliplight (CL26SL-D65)
I bought that on becuase it come with 6500k bulb and i have amazon prime (it's like crack). It also have 2 little led for moonlight effect. Personally i don't really use that, i just plug it to my timmer and let it run.
Anyway, it been running for 1.5 months now and strong enought for most of my plants (and alge).
The good thing is that it use a regular cfl bulb, so you get a new replacement pretty cheap at your local Hardware store.