Get the 1000 watt hps and you wont be sorry. I dont even think 600 watts is enough to grow 6 plants properly.im looking to buy a light i will have good ventilation in a10x14 room growing 6 plants. over all what would be the bette choice for a light a 600w or 1000w hps? i know more is better but is there an advantage of the 600w?