Hey there. It looks like you've got the perennial problem that closet/box growers usually get, temp problems. The only ways I've ever solved the problem usually entailed taking the box out of a closet and also stronger fans. That makes it tough when you have to factor in a carbon scrubber, starts to get noisy/noticeable rather quickly.
This might not be popular to say but if you can't fix your temps (if it's not hot enough to kill your plants that should be taken into consideration) you could always sacrifice on your yield and go with less lighting. Again, not ideal, but your main goal is to get some of your own homegrown with discretion. Good luck.