air circulation is important... very important...
humidity is usualy more of a problem for hydro/aeroponic growers....
lots of water + hot lights = water evaporation/humidity...
things can get bad (moldy) if you don't have good air flow

I always keep a fan on the plants... usually 2,3,4 oscilating fans

Circulation becomes especially important during budding... buds are a perfect home for mold : (