I'm in a process of buying lights and I would like to know if I should be looking for something with fans. How much do fans increase the life of the bulbs? It seems that with no fans bulbs should be replaced anywhere from 6-12 months, what about with fans? Also any tips on good T5 units out there. It seems that no fan units run around $300-400 while the ones with fan go for $500-$800. I'd like to get something with 6 to 8 bulbs if possible, but I doubt I could afford that for the faned version.