Infrared (IR) illuminators are used to provide light for night vision devices. An IR torch can substantially improve image quality through a night vision monocular or scope, providing more clarity at longer ranges. The beam from an infrared torch is invisible, but it can be detected through both digital and image intensified night vision devices. Buy one of the Night Master IR iluminators and you can also convert it to use white, red or green light - making it multi-functional.