it all depends on how your growin.. if your lights are on 24/7 then do the same with the fan.. same for 18/6 and 12/12. you will get your lights really low if your fan is blowin over the tops coolin them dwn..
with 1 400w hps the lowest i managed to get it was roughly 7 inches from the tops but was in fear of burnin them so after 4 days i lifted it a little just in case.
|