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Whoa that was a long post.
I don't know as much as you about all the technical stuff, but I think it's worth noting that most people's experiences with MH and T5 show that their tanks run cooler with T5. Although it's true that some people do change up their cooling system along with new lights, but for those without canopies, this usually isn't the case.
My experience backs this up. I had a 2x250w MH + 4x96w PC Hamilton fixture with an acrylic shield. There were two fans in the fixture that moved air inside the fixture away to one side. I kept the fixture about 6 inches above the water.
I moved to an 8 bulb TekLight that is 4-5" off the water. Before I put a fan (because I wanted to increase output, not because of heat), my chiller was running a lot less than it did with the MH setup.
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