a 1000 watt bulb will give (bud) size and density that is not possible with a 400watt bulb...

2 - 600 watt bulbs placed properly, used to grow small plants is the best bang for the buck.. you can get a huge yield with impressive buds...

400 watt bulbs can not even be comapred to properly used 1000 watt HPS..

and NOW you KNOWM