Hi TheMetal1,

Thanks for all that info, very helpful. But now I have more questions...

What's TFL and how do I do it?

Would I be better off getting a number of ordinary household CFL bulbs and hanging those amongst the plants with the 2 x 250W above the canopy? Would household bulbs give light in a spectrum the plants can use?

I know I sound like a complete numbskull (I'm female!), but how do I go about getting fresh air to circulate in the tent? If I can find one cheap enough online, wouldn't a purpose made extraction fan do the job by sucking fresh air in from the bottom vents? I just got back from the shops where I priced up the materials to make a scrubber, and it won't be cheap. Every thing here probably costs twice what it would in the states. And if your saying that an ordinary in line bathroom fan won't do the job, what's the point?