The ABC-7L Weatherproof Aviation Obstruction Light is specially designed for a wide variety of cranes used in harbours, metallurgies, mines, lighthouses and tall buildings. It consists of LM6 die cast aluminium base and high-intensive glass (or PMMA material), which houses the electronics and LED bulb, providing environmental protection and is also shockproof. The application in harbours shows its perfect waterproof and corrosion resistant performance.