well my loft is pretty big but im going to be growing in a grow tent with a 600 watt hps with 5 plants in there. not too sure of the measurments of my grow tent maybe 1m wide 1m long and 2-3 m high they are ruff estimations. also im looking at maybe a white widow strain or a big bud some thing thats forgiving for a noob like myself. thanks guys!