That was a very interesting article. I'm still going over the numbers here to make sure his are accurate, but the overall point of that article was awesome!
Thanks fish_4_all, for posting that. One important thing to remember when reading that though... that article is based on freshwater requirements. When dealing with a marine environment, some of the animals have different needs than what freshwater plants would require.
This is the reason I mentioned knowing what you are planning to put into the tank before deciding what lighting to use. For marine, T8 works well, but the heat is still an issue. I suggested T5 because that eliminates that problem all together.