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Horticutral Lighting
Tremendous number of passengers fly to their destination through airports regardless day or night. There are also multiple workers engaged in different jobs to ensure passengers has a nice trip. Except for the uncontrollable weather during the trip, airports have a great deal of responsibility to keep safety and security of both passengers and workers. Lighting is one of the significant impacts on safety and security. However, airport lighting is complex due to the wide coverage, myriad zones and high demands. Lighting requirements vary from different applications in airport. For outdoor airport environment, runway, taxiway and apron are three applications that highly depend on the assistance of lighting to achieve clearer identification and visibility. This post would like to talk about the LED lighting requirements of runway, taxiway, and apron.
Runway
Runway lighting is aimed to offer information including distance, alignment, lateral displacement, and roll for pilots by marking edges, centerline, and edges of the runway. Various patterns can be arranged in runway lighting system and pilots can interpret the condition of runway from these lighting patterns easily. Over thousands of lights are installed along the runway that take charge of providing clear environment for pilots, workers, and passengers. Pilots are able to figure out whether they are on the right track to landing or takeoff. Lights for runway are white and of elevated type. But there is an instrument of yellow color at last 400m of the runway to remind pilot to pay attention to the caution zone. Locations of runway lights are regulated that runway lights can’t protrude more than 1 cm from the surface of the road. Black hole effect occurs generally when pilots driving on runway. Pilots concentrate their visual field on the center-line while the edge lights of the runway has moved far and fast in both sides of peripheral vision. Since the contrast of peripheral visual and central visual information, central area present black in color for pilots.
Taxiway
Though airplanes are moved in a low speed at taxiway, serious accidents are also possible to occur under poor visibility condition. Adequate lighting and guidance are critical along the taxiway. Taxiway is located closely to runway and apron. Therefore, taxiway should be easily clarified from runway and apron through different lighting arrangements , or pilots may confused with the proper track between runway and apron. Intersections of taxiway, taxiway-runway, and taxiway-apron should also be easily identified. Clear marks are not only beneficial to classify runway and taxiway but also reduce the risk of accident. Space of lights affects the visual effects as well. A distance about 6m to 7.5m is appropriate for the straight section while 3m to 3.6m for the curves. Requirement of the location of edge lights at taxiway is less strict than runway. Extended distance below 75cm of the pavement surface is acceptable. When a plane going to landing or takeoff, lighting on taxiway edge is blue in color while taxiway center in green. Lights in different color transfer information for pilot to reach right traffic guidance. Lights for taxiway are omnidirectional but not dazzling.
Apron
Apron is one of the busiest applications in airport. Pilots, workers, and passengers are all engaged in this areas. Lighting plays an important role in ensuring their safety and security. Sufficient and uniform lighting without glare and trespass is required at apron. Pilots need comfortable lighting to taxi the plane. Passenger need suitable lighting to guide their way for embarkation and debarkation. Workers need ample lighting to load cargo. LED flood lights are generally used at apron due to high output and ability to illuminate large area. They are installed at least 15m above the ground. Glare, however, will decrease the visibility of pilots, causing sudden blindness to directional and guiding marks. Trespass lighting may distract tower personnel, resulting wrong guidance. Nowadays, LED lights have shields to reduce the annoying glare and trespass lighting.
To achieve appropriate apron lighting, ICAO (International Civil Aviation Organization) stated the apron lighting requirements. The requirements are as followed:
- The average horizontal illumination on the apron should not less than 10 lux. (except for the areas with service functions).
- Optimal uniformity ratio of apron lighting is 4:1. (average to minimum)
- Average horizontal illumination for areas between aircraft stands and apron (parking area, service roads) should be 10 lux.
A large airport may have over 30,000 lights and most of they are on all day long. It means a huge energy consumption for airport illumination. LED Lights are the optimum choice for airport lighting due to their high efficiency and energy-saving. They can save up to 80% energy compared to conventional light sources. LED lights are of long lifespan as well, which means they are cost-effective. Besides, LEDs can offer multiple color options that is ideal for marking and guiding different parts of airport. This is the outstanding feature of LEDs as other light sources do not have color customization. Lighting for airport should also be able to withstand harsh environment, such as high extreme temperature, snow, sunlight, vibration, etc. To overcome former hash environment factors, LED lights should be at least of waterproof and corrosion-resistance.
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