Hydroponic humidity control.

Dehumidify the air in the room containing your grow cabinet. Your cabinet should pull enough outside air for this to do the trick. Attempting to put a dehumidifier inside a tent will increase the temperature and do very little else. I re-purpose my dehumidifier run-off (low PPM, ~20) to build my next reservoir.

I would go with a wall mounted dehumidifier and place it where you think best in the light box. Other than that only dehumidifing the room the tent is in, air movement, and venting will do anything. Now the thing about dehumidifiers in the tent is that bringing in a lot of outside air slows them down but they will still drop the humidity IF you are dehumidifing the outside room where the air is coming from, this works better BTW. If you place in the tent might want to put the intake fans on a timer and run them only periodically giving the dehumids a chance to help more at lights out at least so heat isnt an issue. Good luck this is just what I have done.