if you already have a veg space, i would do 2 600hps in daisychained cooltubes with a 6-8 inch vortex fan for them and possibly a 465cfm squirrelcage as well(possibly not necessary) and i would definetely go scrog, realisticly going for 2pounds a harvest or more. that is just about the same exact size as my old closet. what i did was divide it in half, 1 side 4x2x6(mine was 2 ft shorter) had 8 4ft agrosun full spectrum flouros for veg and the other side 4x2x6 had 1 400hps cooltube and a few 42 watt cfls. with that closet i got close to 1lb every 8 weeks.