Electric Transmission towers Aircraft warning Light
Electric Transmission towers Aircraft warning Light
Medium-intensity white strobe and a high-intensity white strobe.
Medium-intensity white strobes are usually used on structures that are between 200 and 500 feet (61-152.4 meters). If a medium white strobe is used on a structure greater than 500 feet (152.4 meters), the structure must be painted. The common medium white strobe flashes 40 times per minute, at an intensity of 20,000 candelas for daytime/twilight, and 2,000 candelas at nighttime.
Part 2
High-intensity white strobe
Used on structures that are taller than 700 feet (213.4 meters). These lights provide the highest visibility both day and night. a high-intensity strobe does not provide 360° coverage; this requires the use of at least 3 high strobes at each level. On the other hand, it reduces maintenance costs (i.e. no painting). If the structure has an antenna at the top that is greater than 40 feet, a medium-intensity white strobe light must be placed above it rather than below. The common high white strobe flashes 40 times per minute, at an intensity of 270,000 candelas for daytime, 20,000 candelas at twilight, and 2,000 candelas at nighttime.
Part 3
Dual lighting system
In a structure is equipped with white strobes for daytime use, and red lights for nighttime use. In urban areas, these are commonly preferred since it usually exempts a structure from painting requirements. One advantage to the dual system is that when the uppermost red lights fail, the lighting switches onto its backup lighting system, which uses the white strobes (at its night intensity) for nighttime.
Part 4
High-intensity white strobe
For high-tension power lines, white strobes are equipped to flash 60 times per minute, using the same intensities as stated above. Unlike common white strobes, these strobes are specified not to flash simultaneously. The flash pattern is middle, top, and bottom to provide a unique signal that pilot
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