Types of Obstruction Lights
Obstruction Lights are broadly divided into three following parts–

• Low Intensity Obstruction Lights : These lights should be used where the object is a less extensive one and its height above the surrounding ground is less than 45 m.

• Medium Intensity Obstruction Lights : Medium Intensity obstacle lights should be used where the object is an extensive one or its height above the level of the surrounding ground is greater than 45m.

• High Intensity Obstruction Lights: These lights should be used to indicate the presence of an object if its height above the level of the surrounding ground exceeds 150m. According to ICAO regulations Obstruction lights are divided in following types –

• Low Intensity – Type A: Red color steady lights are used for fixed obstacles. Their minimum intensity should be 10 candelas.

• Low Intensity – Type B: Red color steady lights are used for fixed obstacles. Their minimum intensity should be 32 candelas.

• Low Intensity – Type C: These Yellow/Blue color flashing lights are used for mobile obstacles. Their minimum intensity should be 40 candelas.

• Low Intensity – Type D: These Yellow color flashing lights are used for “Follow me” Vehicles. Their minimum intensity should be 200 candelas.

• Medium Intensity – Type A: White color flashing lights are used for obstacles having height more than 45 meters. Their minimum intensity should be 2000 candelas.

• Medium Intensity – Type B: Red color flashing lights are used for obstacles having height more than 45 meters. Their minimum intensity should be 2000 candelas.

• Medium Intensity – Type C: Red color fixed lights are used for obstacles having height more than 45 meters. Their minimum intensity should be 2000 candelas.

• High Intensity – Type A: White color flashing lights are used for obstacles having height more than 150 meters. Their minimum intensity should be 2000 candelas.

• High Intensity – Type B: White color flashing lights are used for obstacles having height more than 150 meters. Their minimum intensity should be 2000 candelas. 



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