Well, I saw the hood idea, and thought that it would be an excellent answer to several problems I'm having:
I don't have enough light in my tank,
I have cats that will end up breaking through the glass cover of my tank
I need a place to put a small
refugium type thing I'm putting together
I figured I can put all of this in/on that hood setup.
So I went to Drs Foster and Smith to see how much the retrofit kits I would need for the lights would cost, but they're actually more expensive than the equivalent full light setups.
Then I went to eBay, looked around, and figured out that if I put everything together on my own, I could do this easily.