It's not 100% lightproof the top of the door and the 2 holes for the fans are the only light leaks but theres about a 1cm across the top like a 50cm wide strip 1cm thick on the door I cut it 2 short lol and then 2 12x12 spots for the fans the fans are in but still light is gonna always leak out. Im not worried about people seeing it as it's in a concrete room in my basement without any windows and theres a door to the room so...