What is the purpose of the Collapsible 45° Circular Modifier that comes with the Solix Bi-color?

The Circular Modifier, when used without the modifier’s fabric diffusion front and mounted properly to the Solix Bi-color, will narrow the beam angle.This narrowing results in greater light control and an increase in the intensity of light projected over a smaller surface area. When used with the included diffusion, the modifier offers a slightly larger softer diffused light source.