I like using multiple smaller lights for the flexibility of it. I own a 1000HPS that gets used only during the winter when it is cool enough, because it gives off SO much heat. I veg under 250MH plus flouros, and bloom under a 400MH plus a 400HPS. I have to add that I have the densest, most gorgeous bus in winter when I rock the 1000HPS plus 400MH in flower! Keeps my house nice and toasty too.

When using multiple lights, a key to temperature control is keeping your ballasts on the other side of a wall from the grow room, running the wires through a hole.

I wish Inside Sun would start putting longer ballast-to-lamp cords on their systems, with a plug instead opf hardwired!