The Lowel 4 Leaf Barndoor Set for the Pro and i-Lights consists of a Barndoor Frame with 4 expandable clip-on Leaves. The frame accepts swing-in accessories, and rotates 360°. Barndoors narrow the beam spread of a light fixture. They help create a 3-dimensional look to a lighting scheme by placing light in a specific area, or by keeping it away. The more leaves a barndoor set has, or the longer the leaves the more precisely the beam can be controlled.