Cool. I put one of those little $6 metal clip on work lights from HD on my fuge and put in a 6500K spiral CFL and it has kicked butt growing macro.
The lid will definitely help with evaporation.
I would recommend an ATO system if you can swing the cash. I think I got my whole ATO up and running for around $100 with dual float switches
and a water tank
that I spray painted black to match the aquarium stand. It uses an aqualifter to move the water, and only requires filling every 2 weeks.