What are the anti-glare lights in the city at night?

City night anti-aircraft lights are searchlights.

Searchlight is a device with powerful light source and concave mirror, which can focus light in a specific direction for long-distance illumination and search. It can concentrate the emitted light beam in a small solid angle (generally less than 2 degrees) with the help of mirrors or lenses to obtain a larger light intensity.

It has a powerful light source and concave mirror, which can focus the light in a specific direction for long-distance lighting and searching. The emitted light beam can be focused on a small solid angle through a mirror or lens to obtain greater light intensity.

As a weapon: during World War I and World War II, huge and powerful searchlights were widely used in the battlefield. For example, as an aid to air defense weapons, it is used to mark the targets of artillery and as a search tool for ships at sea. Concave mirror with a diameter of 1 to 2m is often used for this kind of high-power searchlight. The mirror is silvered inside, and there will be two thick carbon rods at the focus. ?

The edge of the concave mirror is sealed with a round top cover made of heat-resistant and timely glass, which can be removed when the carbon rod needs to be replaced and maintained. The working principle of searchlight is the same as halogen lamp, which requires a lot of electricity to produce strong light. The illumination range of searchlights can reach several kilometers or even more.

The operator of the searchlight will try to blind the pilot of the first plane (also called Pathfinder) of the bomber squadron with the searchlight. Pathfinder's task is to use flares to produce Christmas tree-shaped marks around the target and guide the bombers behind to drop bombs. If the pilot of Pathfinder is blinded by the searchlight, the bomber behind will not know how to drop the bomb.