Godox BD-04 Barn Door with Honeycomb Grid and 4 Color Gel Filters (Red Yellow Blue Green) for Godox QT600IIM/QT400IIM The Barn Door is fixed on standard reflector. With 4pcs leaves for flexible lighting shaping. Take advantage of the 4 color filters to correct the light balance, create dramatic lighting effects or change colors of backgrounds. The Honeycomb designed is to give you ultimate control on the direction of your light. It will emit a beam of light precisely where you aim. These devices alter the shape, intensity, or color of the light output from your flash heads.