While I am at it can anyone give me ideas for ventilation. I am growing in 2 rubbermaid 20 gallon totes and am kind of stumped(not very creative). I have been reading about alot of people useing cpu fans but dont understand how to make it work.hi I was wondering if anyone can tell me about how many lumens you should have to grow 4- 5 medium sized plants under cfl's. right now I have about 12800 going with 8 26 watt bulbs. I was actually trying to find some 42 watt bulbs or 68 but cant seem to find any.