hi ppl iv bin smoking weed,and hash for over fifteen years now and paid out a lot ov money to dealer for shit weed most ov the time ,so im wont to start growing my own,iv managed to get my hands on some white widow seeds,i have a coal house the size is 3 and a half ft by 4and a half ft and 8 ft deep,can any one tell me what size bulb i need my friend has offerd to give me a complete hydro set up the light with it is 400w hps will that be ok ....anyfeed bak would be great thanks....