there are ways to stop light leaks, ask stinky lol. you could vent your box by using a couple of pvc elbows and maybe some dark screening. make a fitting for the hole in the box(better yet make the hole the size of the pvc you will be using) put a couple of elbows together at 90 degrees and that should stop the light from entering or leaving the box. added protection, use some dark screen over each end of the pipe. you would need an intake near the bottom and and an exhaust near the top. i hope this helps, it would be very easy to do.