The official range is 24 nautical miles (a nautical mile is 6,080 feet). At night, most vessels in clear weather can see the lighthouse from up to 20 nautical miles at sea. Seen exactly at sea level, the direct visible range is about 15.6 nautical miles. The USLHS standard was to allow an extra ten feet of height to account for the height of the bridge deck, giving 16.2 miles. At night, the glow or loom can be seen when the light is actually below the horizon; in some atmospheric conditions refraction causes the light to follow the earth's curvature, too. These phenomena are also factored in. The range of the lighthouse depends more on height and air clarity than on the power of its beacon.
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