Dude, I veggged under 2 x 125W blue spec enviro's and they did a lovely job.
I had no trouble with my temps in my small veg cupboard. Just a couple of PC fans for extractors and a small fan blowing on the plants. The lights were never more than 2-3 inches away from the tops of my plants. See my gallery for the pics. They were under the envirolites until about Day 40 ish, then I got a 400W HPS to flower them with. But I am also using the red spec enviro's for side/low lighting for flower, as well as my HPS.
So basically, these lights are ace and you don't need to worry much about the heat output, that's for sure. All the best with your grow man!