Those would heat the room; the lumen loss through an air cooled hood is minimal and the benefits of a cooler/coolable light far outweigh the slight lumen drop. Keep the lights as close as you can before seeing heat problems (upcurled leaf edges and/or pale striping between veins). I can run my air-cooled lamp about a foot closer to the canopy than my non-air-cooled one; you will have to find that sweet spot for yourself.
Your footprint should fall between 4 and 5 feet.