i love hortilux , but not in digital ballasts. ushio now. and after having a magnetic ballast flame out on me ill never have another. my total footprint for 3 side by side systems is 52"x96" which has been great for 2 1k's and i recently got rid of my air cooled reflectors, bought a light meter and parabolic reflectors that allow tons of adjustment for best spread. with the barabolics i can only run 2 over my area so im not sure what ill do with the third ballast i just got, maybe run a bare mh at times.