Low Intensity Obstruction Lights

Understanding Low Intensity Obstruction Lights and Their Importance


Low intensity obstruction lights are a critical component of aviation safety systems. They help identify potential obstacles in the path of an aircraft, such as towers, buildings, or wind turbines that are not visible to pilots during flight.


What are low intensity obstruction lights?


Low intensity obstruction lights are warning lights that emit a steady or flashing signal with a range of up to 32 kilometers (20 miles). They are commonly used on tall structures between 45 and 150 meters (148-492 feet) above ground level. The lighting system typically consists of a single unit or multiple units, mounted at strategic locations perpendicular to each other, providing a 360-degree light output required for obstacle identification.


In most countries, the installation of low-intensity obstruction lights is mandatory for any building over a certain height, and failure to comply with regulations can attract significant penalties. Even more importantly, proper placement and maintenance of these lights can prevent fatal accidents by signaling potential hazards in advance, where it may not be feasible for visual detection.


Types of low-intensity obstruction lights:


There are two types of low-intensity lights, Type A and Type B, both designed differently to meet specific requirements.


Type A emits a constant red signal and is used for structures situated in proximity to airports and other high-density airspaces. Type B emits a flashing red signal and is used for structures located in low-density airspaces or remote areas where there is less chance of obstructing air traffic. Within these two broad classes, some variations include high-intensity strobe, incandescent, LED and other technologies.


Why use low-intensity obstruction lights?


Installation of obstruction warning lights contributes to safe take-off, landing of aircraft, and improved aviation visibility. In the absence of these warning lights, aircraft flying at night or in bad weather conditions may fly into unlit obstacles or clouds close to the ground/structures, leading to fatalities or damage to the aircraft. Over the years, the installation of obstruction warning lights on towers and high-rise buildings have minimized such occurrences.


Conclusion:


Low intensity obstruction lights are an essential tool for aviation safety systems, particularly for structures that pose a threat to flight movements. It's not just a regulatory requirement but also contributes to saving lives by improving visibility in low light, foggy, and other weather conditions. Failing to comply with regulations can attract penalties and risk a fatal accident. Hence, it is critical to install and maintain low-intensity obstruction lights according to industry standards.