Infrared illuminators
IR illuminators are a technique of night vision that amplifies any accessible light to help the user or camera achieve a superior picture. Infrared illuminates use a unique lens that focuses the light onto an image intensifier. This releases electrons which are then quicken with the light power from the device, which causes a cloud of electrons to form, and that cloud gives an better description of the original image.
You may have seen night vision spectacles used on television or in movies. These goggles use the same IR technology. With these types of goggles, soldiers can see at night approximately as well as they can during the day. They cannot see in total darkness, since they amplify at this time existing light, but they can light up nicely even if you don't sense any light source whatsoever. Even the light from an dark moon provide enough light to reveal all on a pair of IR illuminators.
IR illuminators produce infrared light, the name gives that left. light is the spectrum of light that is just a more advance than the visible range for humans. What the name doesn't tell you is that these illuminators duty like light amplifiers for black and white surveillance cameras. A digital lens isn't cramped to the similar set of wavelengths of light that our eyes are. By adding an IR illuminator to your black and white surveillance camera you supply the light it wants to see in lighting situation that any human would call total night, while to the camera, it's as light as day.