here we go....
1x2 and 1x3s on the 20g tank.... 3 x 14w daylight (5000k) spirals. Incandescent value is 180w
2x2s as a rigged box box frame, paneling as a shell (must upgrade later to make it look better now that I have 2 under my belt).
30g tank, 2 x 26w daylight (6500K) + 1 x 14w daylight (5000K) spiral cfl. Incandescent value is 260w.
He is a pic of the guts for the 30g one.
I took home some scrap vinyl from work (was scrap) and it has a good reflection rate and hardly any diffusion. The 20g unit is lined with the reflective vinyl/mylar and the top of the 30g is metallic with the sides being white.