The Fresnel CF4 is a compact Fresnel with a 4-inch diameter lens and a Mini ProLock mount optimized for use with the STORM 80c. It optimizes and amplifies the light output of the STORM 80c and provides a smooth center-to-edge bounce, all in a compact size. The Fresnel CF4, which is compatible with separately available CF4 flaps, provides a compact solution that allows users to achieve greater versatility and control over the performance of their STORM 80c headlamp.