right. to be honest i think youd have problems with more than 1 or 2 hps in that space man id go enviro or get a bigger space.
4 x 70w?? 280w? Just use a 250w.
I used a 400W in a 3' x 3' x 8' high and it was far too hot, had to relocate grow room to control temps. That was with 10'' osc fan and exhaust fan.
well man if it aint broke dont fix it haha
at the moment ive crammed 3 x 70 watt hps and a vertical hanging 200 watt enviro, i now reckon i could get 1 more 70 watt hps and lose the enviro to make more grow space, no heat issues yet.
i wouldnt think there'd be a great deal in it. if anything the 1 light would be hotter
would a 250 hps be cooler running than 4 70 watt hps and cover the same area?