Honestly, I am in the same boat, at least as far as choosing. The Evolves are on sale at Petco and I am considering one. But I am also looking at the Ecoxotic EcoPico.
I feel like the light on the Evolves would not be enough, but according to the box they are LOL. I do not think there are any data on any of the typical nano tanks with lights.
I feel like the one on the Ecoxotic would be sufficient. Or if not, it is upgradable where you can add two more LED strips. But it is also significantly more expensive.