Lighting its a matter of $$$ and the requiered ventilation if u can afford a MH or a HPS u will need lots of vent for that area ..... those would be the best lights to use, since ur looking for the cheapest look into fluoro tube lights or cfl´s they are really cheap and get the job done with good results as far as i know...but imo u arent searching well enough there are hundreds of good posts about these questions just take the time to read them...