How many plants under a 1000W(HPS) to maximize the yield?

[Racerx]

I do 15 plants per 1000 watt if they are growing large, or 30 plants per 1000 watt if they are planter box style single colas. I now use 600 digitals instead; growth seems to be about the same as regular 1000 watts, but less energy and significently less heat. Penetration seems just about as good too. Cant imagine 750 digitals or higher.

Forgot to add a picture. If you do large # of plants per light, then 12/12 them almost immediatly (week or 2 depending on how established the clones are and if they are used to HID lighting). If your doing less plants, veg longer.