i have a 400w HPS in a 2.5 by 2.5 closet that works perfect..covers the whole area pretty well, so any bigger than that, a 600 or at least some side lighting CFLs or something.
PdoubleOTY Reviewed by PdoubleOTY on . Maximum Area for a 400W HPS Light I plan on having about 20 plants flowering at all times in a SOG style perpetual harvest with a 400W HPS. What would be an ideal size enclosure for this grow light, space is not an issue i just need the best dimensions for this size light and plants. I was thinking a 4x4 square flower cab with another about the same dimensions for mother/clone vegging with just cfl's. Rating: 5