Thx I know I still need to vent co2 etc. My question is,is 12 hours venting enough and you don't think 20,000 lumens is enough to veg 12 plants in a 2 x 4 area? All of them will fit under perfectly under the ballast since the 4'. 4 bulb is 2 x 4 hmmmm any one else have you tried @ the same...