I have 6 bars with 2ea 3400 lumen GE Eccolux lights.. I love them...on a 18/6 light and 6 minute drip system per day...i have a special blend of soil... my last batch yielded 6 1/4 lbs off of 17 plants... I also found that using a simple 2" fish tank airator increasesd my room humidity by almost 10 so instead of 33 its now 42% with the room at 78... the plants are in heaven!!!!