An infrared illuminator, or IR illuminator, is a tool that emits light in the infrared spectrum. Infrared light, or infrared radiation, has wavelengths longer than visible light and is usually experienced as heat. Infrared radiation is invisible to the human eye, but to night vision devices, an IR illuminator functions like a flashlight.
The clear advantages of IR illuminators are that they allow night vision to function with no visible light on the scene and are a relatively inexpensive way to drastically improve the sensitivity of a device.
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