I have read that plants respond to .007 lumens of light. The brightest night with a full full moon can get is .003. So think about how dark your room needs to be. I grew up in the boonies, so I know what dark really is, and if you have small light leaks, as long as it isn't strong light rays, it will be fine. I (may or may not) grow in a closet, all I do is keep the cracks double taped. You can still see a light glow of the tape, but if I look down, I am unable to see my hands. If you can look down and see your hands, its too light. I have always had a normal/acceptable male:female ratio.