Perfect Light for Night Vision Optics
IR illuminators are not really visible to the human eye unless you look directly at the bulb at close range. You cannot see a beam or any kind of light coming off of it unless you are looking through a night vision device.
The 850nm lights generally help you see much further by throwing off lots more light. It has a red glow if looking directly at the bulb.The distance you can see is also related to the proper aiming of the illuminator with the scope.
A8S IR flashlight is zoomable,this means that you can widen the beam to a more of a flood light for up close situations. Or you can twist it into a spot light position for more far away scenarios.If you are looking for range, this is the light!