Don't let your prey spot you before you spot them!
The Dark Night Outdoors Light diffuser is designed to limit visibility of the IR light your target can see. It allows light to pass through, but when slightly angled your target will not be able to see the light. Works like a Anti-Reflection Device (ARD) for a optical lens, but is adapted to limit the angle in which your target can see the light emitted from your IR Light. Light output is only slightly affected, plenty of light is allowed to pass through the hexagonal channels
Digital night vision does. It picks up near-infrared light, and on dark nights it needs an IR illuminator to light the scene. That light is what this diffuser controls: the beam still reaches the field, but an animal off at an angle sees far less of the emitter.
To your eye, an IR illuminator shows as a dim red glow at the emitter, or nothing at all at longer wavelengths. Through a night vision device it lights the field like a flashlight. The hex channels on this diffuser hide that glow when it is viewed from an angle.