2' x 2' = 24" x 24"=16-6 inch pots or 9-8 inch pots...if you use 6 in. pots, then flower at about when plants are 8-10 inches tall( at most)....lights will hang some from ceiling or roof...plus the space needed so plants won't get burned by light....paint inside white to reflect light( i used 1 ft. sq. mirror tiles...4 total...2 on back wall ...one above the other.. and 2 on door.. the same way..in small areas they DO work very well. in large areas... no....light was reflected back greatly from the mirrors onto the plants)....Heavy