The Lowel Half Scrim for Omni Light is basically used to avoid light falloff and has a 360 degree rotation for each situation. It can provide a balanced light spread while focusing the light on a subject or a background.To mount this half scrim, either a complete barndoor set or a barndoor frame is necessaryYou can use the spring tab to mount the scrim on the barndoor frameThis Lowel half single scrim can also create a dim light intensity across the beam spread