Yeah you want to keep an eye on the temps so that they stay in the 75 - 85 range with 80 being ideal. Going below 75 is not a big deal but too far below and growth will slow. You want to keep away from the high temps. They can deal with 90 for a bit they will suffer over time. Same goes for humidity. I can't recall the range but I believe you want it in the 35 - 50 percent range. Too high and you risk mold and pests. Either of those fan controllers will work.

Moving are is for more than just temps. You want fresh air for the plants all the time. Also, you will want a fan blowing across the tops of your plants. It causes micro stress to the stalks which strengthen over time. You will want that strength later on once the buds start to get heavy.

What is the wattage on that light? You said it was a cooltube yes? I still think you should hang it vertically. You will achieve much better results.
bigsby Reviewed by bigsby on . Can I vent this? Hey so this is my first grow and i wanted to buy this Grow Tent and 400w HPS kit but i'm not quite sure how to set up the ventilation. is it ok if i just set up small cfm fans without ducting? i don't want heat to be an issue, but at the same time i want to keep it as cheap and simple as possible since the tent and light were pricey enough :) any help or tips appreciated! cheers Rating: 5