The general rule of thumb is .5grams/watt under ideal conditions, no matter how many plants ya have in there. Also, do ya have Sativa's or Indica's (or a mix, for that matter)? How's the ventalation?
Personally, I would go with 3-4. If anything, it'll give ya a good idea of what to expect next time without really hurting yer plants...


Fly High!
MrGuy Reviewed by MrGuy on . How many plants under a 600w HPS? Hi, as you all know I have a 600w HPS in a cabinet lined with mylar. Im just wondering how many Lowryders Ill be able to grow under there. By the way, I can fit 6 in, but depending how well they do in the small pots Id be able to fit 8 in. Rating: 5