oh ya i got one... what are the demensions of that room you're growing in
Dimentions of the room are 2.2m high, 1.6m wide and 1.10m deep.

I think you are just wasting energy, by using 1200 watts for only six plants
Well, I have better results with 6 plants under 1200w compared to 24 plants under 1200w. I get about 0.8 gramms per watt on 24 plants and about 0.9 gramms per watt on 6 plants. I think it's because the plant has more room and it's more natural.