My :twocents:
I've been using CFL's the whole way until now.
I added a 70 HPS after finding this chart showing a plant sensitivity relative to spectrum.
I'm a layman here but this is what I gather. My CFL's are 2700K while my HPS is 2100K(a more usable spectrum). I'll start flower on CFL but finish under both. Heat in a small space is an issue for me too, but when I look at my "warm" CFL's next to the HPS its obvious.