The AD401 has a wide range of application. With an open-structure design, the Fenix Diffuser Lens adapts to any headlamp or flashlight with a diameter of 20 mm -21.5 mm.

This lens adapts to the following Fenix flashlights: L1D, L1T, L2T, L2D, P2D, P3D, LD10, LD20, PD20, PD30, HP10