Good questions... trial and error is the best way to find out. As for the size of the room, well, as big as you can make it. Build it yourself or buy a used closet with flat white walls like mine. Here's a good link about grow room setup:

http://boards.cannabis.com/indoor-gr...-progress.html

I don't have any experience with small MH's... sorry. It's all about lumens, so the more lumens per square foot, the bigger the plants and the buds will be. I would aim for 5000 Lumens per square foot, or more. Also having the correct color (Kelvin #) for veg and flowering will make a difference. Since you have them already, try them out. But if the temps get high, get more cfl's instead. A couple more good links to answer your questions better:

http://boards.cannabis.com/indoor-li...-lighting.html

http://boards.cannabis.com/indoor-li...uch-light.html
bigtopsfinn Reviewed by bigtopsfinn on . Long time no grow What's up everyone it's been a while since I have been around here or raised the beauiful life cycle of my favoite female. Life Has been one he'll of a ride for me over the past few months but the postive side of things is I find out later today if NH pasted HB 648 medical marijauana law. Well if all is well with it I'm going to be assigned my wife's mom caregiver( even if not she wants me to grow it). Well my point is she has sever arthrist and spinal issues and she's always doped up on Rating: 5