I was wondering what woulb be better to do, (2-3/3 ) ebb and flow tray or the 12 pot multi pot system? I will be using a 2 600 watt lumateks on light movers. I would like to acheive a pound a month, Also what type of increase in my bill would i see if i was using a mh 400 18/6 and the 600s...