What is the use of the infrared night vision lamp of the camera?

Hiding from the person being photographed.

The LED light on the infrared camera is turned on at night when there is no light or the light is weak, and the picture is still clear when it is taken on people or things. This light is invisible to the naked eye and hidden from the person being photographed. Infrared ray is also a kind of light, which is invisible to human eyes.

Infrared night vision lamp is based on the physical principle: as long as there is a temperature difference between adjacent objects, high-temperature objects will transfer heat to low-temperature objects, mainly through infrared radiation. High-temperature objects emit infrared rays, which can't be recognized by human naked eyes, but the photosensitive element CCD or CMOS of the camera can receive and convert them into electrical signals, and then process them into images.

Extended data:

Infrared is an electromagnetic wave with a wavelength between microwave and visible light, with a wavelength between 750 nm and 1 mm, which is invisible light with a longer wavelength than red light. The band covering the thermal radiation emitted by an object at room temperature. The ability to penetrate clouds is stronger than visible light.

It is widely used in communication, detection, medical treatment and military fields. Commonly known as infrared light. The real infrared night vision device is photomultiplier tube imaging, which is completely different from the principle of telescope. It can't be used in the daytime, it is expensive and needs power to work.