Wwwaaayyyy to general of a question. It would be better if we knew type of plant type of growing, how tall you can grow to, how big your want your plants to be, and how good of reflecting you have. Probably with the ammount of information you gave like osh gosh anywhere from 1-30 or 40. but i would go with maybe 8 medium size plants 6 medium large, or 4 big plants. If you want sog (Sea of Green) you might go for anywhere from 25-35 in which the plants go into harvesting right when they have rooted from clones, and you just grow the top colas.