hello : )

the key to growing with a 4oo is to get that light as close as possible... if you have a glass cover between your bulb and your plants you cn get the light within 6 inches of your canopy... use as many fans as it takes to blow the heat from the bulb upward and away from your plants...

if you can hang one of the 400 watt bulbs verticaly between 4 plants ... and another 400 watt bulb horizontaly over the same 4 plants you will yield HUGE...

you may even yield 4 - 6 ounces per plant... that is impressive!!

: )