Mold Hazard in the last third of the grow

here's the thing with molds --- they spread faster in drier environments and reproduce faster in moister environments... Stick to whatever you vpd says you should be at or just try to be around 50%. <65% for mold concerns, for sure. There are competing factors here.. what;s best to control transpiration and what is risky. It's going to be a bit higher humidity than ambient in the volume of air immediately sorrounding leaves, which is the more important measurement. So, to be safe, i'd reduce to 45-55% range of control. the more foliage, the more moisture released into the air. The RH% spike is at leas in part tied to the drop in temerature. A slightly warmer temp will reduce that spike, if dehumidifier cannot keep up. if yo don't have a dehum, get one large enough fro teh entire room, not just tent size. If you exhaust outside or to an isolated area, you can go a bit smaller.. .but always better to get larger for dehums and humidifiers / ac / heaters etc... less wear-n tear and usually more efficeint due to scale typically pays off in total cost of onwership over lifetime of unit(s). Just like duct fans.. get the one you can run at 50% or lower.... Not the one you gotta run 80-100% .. it'll be louder and you'll kill the fan faster -- just have to buy one sooner, relatively speaking.