I have a 10x12x10 foot room.. With 12 plants.. My partner put in 6 large lights with 1000w HP's bulbs... Is that overkill with the lights?
5 x 4 for each light, no that's not over kill, I think that's like 50w per square foot, which is where I like to be if I am not using co2, so you are good!
And it seems the plants have slowed growth.. Def not root bound either.. It seems like leaves are yellowing and dying off more than they should be..