Quote Originally Posted by ToKnoIsToGro
This particular 42 watt puts out 2,700 lumens

Well break it down like this a 100 watt MH bulb is about 9000 lumens.
Your 42 watt bulb is only 2700.
A 400 watt MH bulbs give about 55,000 lumens.
Do the math.
DFG

Also let me add that alot of your light will be lost just plain facts your lights are to low to produce good marijuana.
Dont get me wrong it will grow but you asked questions and I am trying to help you out.
DFG