I don't know how much money you have to spend, if you can afford it, but some LED's. they add almost no heat, and you'll get air movement. Not to turn this into a lighting thread, but I have used HPS/MH and LED's and by far LED's are where its at. Biggest BANG for your collective dollar. (Energy bill)/ (grams/M sq.)
They make supplementary lights for only the flowing stage. I have gone through a couple mnf. I use lighthouse now and they are solid lights. Something to think about.