I use led lights . The growing chamber is 8 x 2.5 x 2 5 feet. I try to keep it at 80%. For now i use cool air from outside. I know people lost plants because of that but was checking that all the time and the hygro temp was keeping it at max 20c
I'm also pumping in cold air for now for my chamber. High 20C, low of 10C.
Can we see pics of your whole set up? I'm already thinking of building a new, more aesthetic chamber. Mine is just through together with 2x2's, plywood, and foam insulation. Looks super ghetto from the outside.