Controlling environment in closet with no intake fan?

Tent will always be 5-10 hotter then your atmosphere around it due to lights can try an make vents to pull cool clean air from room. for humidity control you can get a small humidifier you can pre set what you want it to be at. Just a lot of trail an error to correctly figure the perfect but I environment. I would definitely try to exhaust the air from the tent out the closet due it sucking out hot air an putting it back in. Another thing you can do is get some small 6in desk top clip on fans to put in the tent also to get more air circulation.