it can be ideal for 50 small plants, or one huge lst'ed plant, in your case what u asked yes 6 plant will do...question is how much coverage will those 6 plants need.
well i have about a 12.5' cealling and if anyone knows approxematly how much bud could be produced from each plant if maintained well and kept healthy?
i know it depends on the strand, lets say a northern lights strain in soil.