just checked hight for kicks and the largest female i have is pushing 30inches with out pot mantaining atm giving me about..... 1-2 months to decide when i want to flower before i pass the point of no return. i cant bring my self to top the mighty xmas tree. im contomplating the idea of using the 150 for my single large female, and relying on many many toped and tied clones along with what ever els comes from the bagseeds i have. this would put me at 690watts over my space. 550h.i.d. i know its not even 25watts a sq foot but i think i will manage, with reflective walls and hanging cpfs where ever there is a shadow.