What is the purpose of the fuge?
If the main purpose is to grow macro algae then I would blast it with as much light as you can. In this case I would use a bunch of cheap bulbs that use regular sockets (try to find 6500k bulbs but 4300k will work just fine for algae, just looks really yellow). Or go all the way and use a single metal halide bulb with a cheap grow light.
If the main purpose is to grow pods to feed your tank, then lighting is not as much of an issue.
And by the way I checked my utility bill and electricity has gone up, not to 11cents, mine was more like 8cents a KWH, but not 6 like I remember
