Added 3rd autocob 3500k to cabinet as well. Having trouble keeping temperature above 70dgf since I added my new ventilation system. Using a variac to run it as slow as it will run, temps still not hitting 70dgf, so I added a third autocob. Keeping two of them (autocobs) over the Double Grape at 30", and keeping the lights on 24/0 until spring comes to my part of the world. Good news is that excess humidity is a thing of the past as readings are 40rh right now.