i'll have a new thread up in a couple days for my indoor grow here.
regarding humidity, i will buy a dehumidifier if necessary, but i somehow fail to see how effective it can possibly be if you're constantly drawing air into the room and exhausting air out :-/ it would only work if you had a really powerful a/c in the setup such that the intake comes through the a/c, at least that's what i think...
but again, to take care of the humidity, i really do think having a lot of airflow and ventilation is the key to it...even if it's humid, if there's a ton of air blowing around i don't know if fungus will be able to form. i will obviously have to stick to the buds with a more sativa like structure. as of right now, i'm sort of doing a test run, just planning on running 1200W in the room (exclusive of veg) to see the potential problems i face. if it gets too hot, then i will have to do something about that, as well as the humidity. i think the key for me will be to have different plants in different stages of their flowering cycle.
i have done more than a little bit of research and i think the key to maintaining temperatures is to grow vertical bare bulb. i will be trying a 1 sq. mtr sog as well under a single 400w HID bulb and reflector just to see and make a comparison. ATM under 400W HPS bulbs without a reflector, my plants are as close as 4-5" away from the bulb and are showing no signs of distress whatsoever.
when growing indoors here, the problem i vastly underestimated was pests. fungus gnats love the soil, the way the moisture just stays, and they will screw up the germination of your seeds in a heartbeat. yellow sticky strips (gardenguru, bangalore) is a great way to cut down on the numbers. but they reproduce on the soil, so killing a mature fly doesn't kill its offspring. to do this, put an inch deep layer of construction sand or perlite on top of the soil so that the dirt is not accessible. within 2 days the sticky traps were peppered with fungus gnats and when i'd normally move a pot and see a bunch of flying irritating pricks, i now see none. updates very shortly with pictures. stay tuned for a new thread.