The white light of the surveillance camera is always on. Why is the white light of the surveillance camera always on?

1. This is the normal working state of the camera and does not need to be turned off.

2. The camera converts optical image signals into electrical signals for storage or transmission. When shooting an object, the light reflected by the object is collected by the camera lens and focused on the light receiving surface of the camera device (such as the target surface of the camera tube), and then the light is converted into electric energy by the camera device to obtain a "video signal".

3. The photoelectric signal is very weak, which needs to be amplified by the preamplifier circuit and then processed and adjusted by various circuits. Finally, the standard signal can be sent to a video recorder and other recording media for recording, or spread through a transmission system, or sent to a monitor for display.