You won't need a fan speed motor controller with just 1, I use that for my air cooled light and don't need it to run anywhere near full speed to keep my light cool. I run my air exchange/Filter fan 24/7 full speed throughout the grow, you don't want stagnant air or loss of negative pressure, what you want is that air to be continually renewed. This helps with two things, getting out the heat and bringing in fresh air and Co2. What you do need is a filter, growing weed has an incredibly strong and overwhelming smell, I use a carbon filter and one Ona odor neutralizer in my cab and one on top of my cab, and my weed isn't even one of the smellier strains but this makes it undetectable. I have friends and family over, workmen you name it, and just keep the door of my office closed and nobody suspects a thing. The only reason I keep them out of the office is the sound of the fans, not the smell. But when necessary I can just hit a switch, kill the power for everything and not worry about either sound or smell. Also what do you mean by a light controller? Do you mean a Timer?