This document discusses various factors related to airport lighting, including airport classification, traffic levels, available power, aircraft types, night operations plans, and weather conditions. It describes the standardization of airport light colors and arrangements to guide pilots at unfamiliar airports. Regular maintenance is needed to keep thousands of lights clean and functioning properly, with emergency backup power in case of outages. The key elements of airport lighting are identified, such as beacons, approach lighting, apron lighting, and different types of runway and taxiway lighting. Specific details are provided about airport beacon systems, approach lighting arrangements, and the Calvert system for approach lighting guidance.