The short answer is yes, you can! You would want to identify a few issues with it though; like pop stated, do you have power in the shed?
When looking for leaks in your roof, it's best to recreate conditions that will help show where the leaks are. If you can, take a garden hose and shower the heck out of your shed roof and see how watertight it is. If the roof has flashing, check to make the caulking around the edges isn't cracked or busted. If it's tin, you can remove pieces of it and slather down some roofing tar and place the tin back down (fixed many 30+ year old leaking shacks doing this.)
You'll also want to make sure you have adequate ventilation into the grow tent and adequate exhaust. If the grow extends into winter months; you'd want to address insulation and heating.
Hope that helps out bro!