Sullivan's Island Lighthouse also called the Charleston Light marks the entry to Charleston Harbor. ..Sullivan's Island, South Carolina, which is the northern entrance to Charleston harbor, was built to replace the old Charleston light on Morris Island. Construction was started in 1960, and it was first lit on June 15, 1962.The lighthouse has a steel frame, an aluminum alloy skin, and a modern triangular cross section. It is 140 ft (42.7 m) tall. The focal plane of the light is 163 ft (49.7 m) above mean sea level. The daymark is a black upper half and white lower half. It is the only U.S. lighthouse with an elevator and was the last manned lighthouse to be built...It has a DCB 24 light. It originally had 28-million candela (candlepower) that was the most powerful in the Western Hemisphere. As the light was actually too dazzling, the power was lowered to 1.2 million candela that still be seen over 26 miles. Its characteristic is two 0.2 s flashes separated by 4.8 s every 30 s. The light was automated in 1975.
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