Double obstruction lights usually have "Service+ Service"and "Service+Standby" functions, to ensure that one light is broken and there is still another working, this type of aviation obstruction light is usually used on top of tall buildings, iron towers, and other important places where replacement is inconvenient. In this way, it can better save costs and ensure safety.

There are various types of obstruction lights used to indicate the presence of obstacles such as buildings, towers, or other structures. One common type is the double obstruction light.

A double obstruction light consists of two lights placed on top of each other. These lights are typically red and are used to warn aircraft pilots of the presence of tall structures that may pose a hazard to their flight path. The double lights help to increase the visibility of the obstruction, especially in low light or poor weather conditions.

The purpose of the double obstruction light is to ensure the safety of both aircraft and the structures themselves. By providing a clear visual indication of the obstruction, pilots can take appropriate measures to avoid it and navigate safely. This is particularly important during takeoff, landing, and low-altitude flight, where pilots need to have a clear view of their surroundings.

The double obstruction light is typically installed on top of tall structures such as buildings, towers, or antennas. These structures are often located near airports, helipads, or other areas with significant air traffic. By having a double light system, the visibility of the obstruction is enhanced, allowing pilots to easily identify its presence and make necessary adjustments to their flight path.

In addition to their primary function of warning aircraft pilots, double obstruction lights also serve as a visual reference for other aviation personnel. Ground staff, air traffic controllers, and other individuals involved in aviation operations can use these lights to identify the location and height of the obstruction. This information is crucial for ensuring safe operations and preventing any potential accidents or incidents.

To ensure the effectiveness of double obstruction lights, they are typically equipped with features such as automatic activation, intensity control, and monitoring systems. These features help to ensure that the lights are always operational and visible, even in adverse conditions. Regular maintenance and inspections are also conducted to ensure that the lights are functioning correctly and meet the necessary safety standards.

In conclusion, double obstruction lights play a vital role in aviation safety by providing a clear visual indication of obstructions to aircraft pilots. By enhancing visibility and warning pilots of potential hazards, these lights help to prevent accidents and ensure safe flight operations.