I wouldn't put any more then 4 plants and yield is going to difficult to predict unless you grew the same strain before and had a rough idea what each plant produced, it all depends on many factors as well, size and intensity of the light, efficacy of the light, what nutrients you're using, what method of growing you're using, genetics of the seeds, which seed bank you used and so on so forth, so a accurate perdition would be just a wild guess...Good luck and hope you