Venting directly through air cooled hood... mold problems?

only if it comes in through the mesh ports... doesn't the air flowing over bulb come from inside tent? if not.. why not? this wil extract air and cool bulb. without humidity, not much microbial growth will be able to gain a foothold. optimally, you want air being extracted and exhausted outside... or at least outside that room, otherwise you are just sucking it back into the tent. Big part of that air exchange is for microbes and promoting transpiration with non-depleted CO2 levels.