Barn Doors for Magnum, Tele Zoom & Narrow Beam Reflector. Barn Doors are great for flagging off light & shaping the light spread without changing the light characteristics. Each set of Barn Doors has four doors. This means that you can create an asymmetric light spread. For instance, you may want a sharp fall-off on one side & a soft, graduated fall-off on the other. Not compatible with the Narrow Beam Travel Reflector.