Optical DynamicsTM knows how handle nighttime shooting. Its Collimated Amplified Lens System throws light only where you want it and nowhere else. Imagine, a clear, narrow adjustable column of light that perfectly illuminates your target and not the entire area. It's all possible thanks to CALS,TM a patented photonics lens system that projects 100% of the light beam on the target. No light is wasted, sprayed or splashed back to illuminate the user. Shine a bright White beam up to 500 yds. wherever you need it.