i used to have my tent split down the middle with two 250w light setups i did it with two sheets of black plastic about 4 inches to long and to wide hung them together and like the letter "I" where it met the wall iused duct tape a hole near top for duct work bottm vent open
i later covered black plastic with reflective material
ran fine sativas on one side indacas on other i had to break it down tape was a nightmare now i just use both lights at same time in one tent no seperations now i have a little closet etuo next to tent i use for startups i dont do clowns and moms but i do use it for autos diesel ryders got 2 in there now
good luck 1 love