Compact Flourescents

Ok, everyone, please excuse my ignorance if this sounds too stupid... How 
would 4 or 6 incandescent fixtures, each with a compact flourescent installed 
in it work for my 55g? Does anyone have some specifics on these bulbs? How 
many of these would ahve to equal one 40 watt flourescent?

Price is a big concern here. The initial investment for 4 or 6 incand. 
fixtures and the bulbs would be VERY low. What's the long term costs?