Thanks Dylan,

I've been looking at a few HPS setups, but I'm not sure if I'll be able to keep the temps down.

My space is 80cm x 40cm x 140cm, and they are in 12" pots. If the light stays high and the plants dont creep too tall, might I be able to get away with no i/o ventilation for a 400W hps? The door will be open quite a lot and I have a fan too.

I'm bidding on a 400W to come through in about 2 weeks, sounds like a good time to start flowering.

Thanks for your help.