Obstruction Warning Lights in the Aviation Industry are of three types - the airport beacon, the identification or code beacon, and the hazard or obstruction beacon.

The obstruction light/s should be located so that it should reveal the top of the airway path obstacle. The obstacles which are not high above 45 meters, an obstruction light should be mounted on the top. However obstacles those are higher than 45 meters, multi-layer obstruction lights should be distributed at the obstacle but the separation should be less than 45 meters and as equal as possible.