What role does the LED fill light next to the public security surveillance camera play in urban roads?

There are also security surveillance cameras in front of schools, key intersections, and alleys prone to public security cases. These cameras are spherical, cylindrical, square box-shaped and so on. Some of these cameras are equipped with LED fill light, which is always turned on at night to ensure a clear view of the camera. The main purpose of setting up these cameras is to apply all kinds of captured information to public security prevention and control, identify the facts of the case according to the image records, and lock or even capture all kinds of criminal suspects.