How about auto flowers, seems perfect for a small space, especially with LST and/or a scrog, with the 315w I've seen some utube grows that are impressive....definitely not a new grower, I'm leaning towards that light, if theres a heat issue I would vent it, actually worried there won't be enough heat in the area the cab will be in, my thoughts are a warm room maintains an ambient temp in the cab....does venting the cab back into the room the cab is in, make any sense or I'm I over thinking this....I always do