Interesting. I like it... wish I went that route instead. Total cost could come in about the same as the ready made strip I bought, but yours sounds much closer to a moonlight analog. Also, I would have had more fun building it then just taping the strip on to the fixture
Now, you can add a breadboard with a programmable circuit so the lights come on in sequence, and the voltage slowly increases so that you can simulate moonrise. Maybe even set it over a 1 month period so you can get the waning/waxing gibbons effect of the phases in there. Now that would be awesome (albeit completely unnecessary, but still fun
). I think I could come up with some statistics to show how healthy that would be for your fish to justify it.
Heck, you can use statistics to prove anything. 96.4% of people know that!