humiditiy ?

is it ok to have 40% humidity during vegetation? ... does it affect growth or vigor at all?

Usually 50 - 60% is recommended for veg stage. I used to live in a town 1300m above sea level, where humidity is between 25 - 45%. No problems there. The leaf to my knowledge will "seal" itself to keep from de-hydrating, and might then increase potency in the bud.

If I'm wrong about something, please correct me...