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Aviation lighting

Aircraft warning lights
 are high-intensity lighting devices that are attached to tall structures and are used as collision avoidance measures. Such devices make structures more visible to passing aircraft and are usually used at night, although they may be used during the day as well. These lights need to be of sufficient brightness in order to be visible for miles around the structure.

Traditionally, red lamps (or beacons) use incandescent filament bulbs. In order to improve the otherwise quite short lifespan, they are made with a ruggedized design and are run below normal operating power (under-running). A recent development has been the use of arrays of high-power red LEDs in place of incandescent bulbs, which has only been possible since the development of LEDs of sufficient brightness. LED-based lamps have a significantly longer lifespan than incandescent bulbs, thus reducing maintenance costs and increasing reliability. Several manufacturers have also developed medium-intensity white strobes based on LED technology to replace xenon. Xenon flashers, whilst more visually impressive, tend to require frequent replacement and so have become a less favored option. However, with the advent of LEDs, white strobes are still somewhat desired

There are a medium-intensity white strobe and a high-intensity white strobe. Medium-intensity white strobes are usually used on structures that are between 200500 feet (61-152.4 meters). If a medium white strobe is used on a structure greater than 500 feet (152.4 meters), the structure mustbe painted. The common medium white strobe flashes 40 times in a minute, at an intensity of 20,000 can delas for daytime/twilight, and 2,000 candelas at nighttime.