Among them, emergency lighting includes standby lighting, safety lighting and evacuation lighting, and its application principles should meet the following requirements: 1. When the normal lighting goes out due to a fault, the lighting of the equipment should be installed where normal work or activities need to continue; Second, when normal lighting goes out due to failure, safety lighting should be installed where it is necessary to ensure the safety of people in danger; 3. When the normal lighting is extinguished due to a fault, the exits and passages that need to ensure the safe evacuation of personnel should be provided with evacuation lighting; Four, the duty lighting should use part of the normal lighting that can be controlled separately or use part or all of the emergency lighting; Five, safety lighting should be installed in a safe range according to the need; Six, the installation of obstacle lighting, should strictly implement the relevant provisions of the local aviation or transportation departments.