What are the searchlights on the roofs of some cities for?

The searchlight on the roof has three main functions:

First, give priority to decoration, adding night scenes to the city and adding color to the building;

Second, it can be used as a searchlight at night to warn the public security near hotels and buildings;

Third, by the way, it also plays a warning role in preventing the plane from crashing into the building.

At present, the searchlights on the roof are basically LED searchlights, which have long irradiation distance and low power consumption and can be seen from far away places. Generally used in the roofs of large hotels, parties, KTV and office buildings.