Well I'm growing gorilla glue, blue dream and mku in a 4 by 8 by 8. I have 8 plants in there and it's getting kinda crowded so next time it will only be 4 plants. But all My plants are doing great with only the veg light! I mean My plants are 7 weeks old and 23" tall. I won't be using the full spectrum until they go into bud,Which I started 24 hours ago. They will have total darkness for 12 more hours! 36 hours of darkness altogether. They all looked Great when I closed up the tent and I'll know more tomorrow!