Nice environment! That'll work out really well for you
RE: RH% - Take this advice with the caveat that I'm in the desert southwest of Colorado...but
I would always rather have low RH and have to work up than have high RH and have to
work down. The speed of the exhaust fan is basically going to control your RH numbers
(along with whatever your ambient RH is) but I would grow in 33% all day long and twice
on Sunday. 20-60, IMHO...is completely workable.
It appears to me that when plants transpire, it brings the RH way up...bigger plant, bigger
effect...so keeping that exhaust going good really controls that. I found that out by a fan
quitting on me. RH shot through the roof...LOL!
Oh yeah, and I voted White Widow....
My first grow was a Dark Devil and it was great, but my most recent harvest
was Dinafem's White Widow XXL and it was over 9 ounces dry.
