Right,my room didnt cost too much to build etc,,,,i had some lengthes of mdf given to me by a neighbour,,,,i had mini fans and a cpl of extractors too,,,i only had to buy the lights,i went for a blue spectrum cfl i paid £35 for and i also got a red spectrum for flowering again 250w,,,so i paid out around £80 in total just for my lights.i set it all up on my loft,which was quite easy,i had a vent in my roof from an old heating system in my house,so i fitted my fan to that for extraction....i did grow my plants out side in a growbag tent and i started to flower them when they were 4-5 ft tall(way to tall for my lights)but you live n learn......i had a healthy yeild from them,but as the light wasnt able to penetrate all the way through the canopy i lost a lot of the lower branches etc.....next time i will grow my plants no taller than 2ft and i will only flower 2 plants at a time,,,should get more yeild from em then....