Have you thought about just doing PC lighting?
http://www.jlaquatics.com/product/pc...t+Fixture.html
I don't really love the fixture but for the price, you could buy two, take them apart and re-install them in your own little canopy and have 4 PC bulbs in there.
Here's another option:
http://www.catalinaaquarium.com/prod...oducts_id=1565