If all you have is a single grow spot I'd consider growing autos. Start a fem seed every month and just keep your light on 18/6 or even 24/0 if that helps keep the temps in the tent steady.
They grow smaller and in something like 2gal pots wouldn't likely get more than 2ft tall. Once your first plant reaches harvest in 3 - 4 months you'd have another to harvest every month so a perpetual grow scenario. In Canada with the 4 plant limit it would stay legal too.
You don't need a fancy light either. I bet my little COB LED would do a fair job and they are barely over $100 on amazon and mine pulls 200w from the wall. I'm using it in a VivoSun 2x4x5'h tent for veg and clones and wish I had a 3x3 instead but it was used gear I got for cheap so it is what it is.
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My exhaust fan for it is a little USB powered desk fan stuck in the vent on the top that vents right into the room. I just crack the bedroom window if it gets too warm in there. Keeping the humidity up is a bitch if I vented outside. No carbon filter as they're just vegging but you'll want a good one for flowering plants. Exhaust fan noise can be annoying so try to get one with a speed control. Even a 4" inline fan running half speed will be enough for that size tent and would blow a lot more air than my little one. You can get or make a silencer for the fan too. Just a box stuffed with insulation around the fan quiets them a lot. My main grow room in the basement has all the bells and whistles to maintain the environment and where the plants go for flowering.