One thing,,I use a Closet,,and there is no way you are going to get rid of all the light leaks without shuting out much needed Fresh AIR,,unless you are pulling it in from somewhere else,,,and those plants need lots of fresh moving air or the will not grow very well. If the door to the room where the closet is,,,is closed,,nobody should see the light coming from the closet. If you live at home with your parents or something,,then,,IM out.
If not,,then I dont see the problem.Keep the door closed to that bedroom,and tell your friends to keep thier asses outta that room.
AND give your plants lots of fresh air. Mine are only closed up(the closet doors) at night during flowering.