For a small op like that, you're not going to get busted because of heat. And it's not hard to seal the room from light. In fact, you'd have to seal the room from light anyway, since light leaks during flowering will mess you up. I have mine going on a reverse schedule because of the heat, and also because I have it in a room off of my bedroom, so I'm in my room during most of the time it's on, ie at night.