Definition
A major light structure with a high focal plane, typically 20 to 60 metres, and a nominal range often exceeding 20 miles. Charted with a magenta flare and the full characteristic. Daymark colours and bands are given in the Admiralty List of Lights, which is the authoritative source, more detailed and more frequently corrected than the chart. Many are now unmanned, monitored remotely, and increasingly LED-equipped, which can reduce the loom formerly seen from incandescent lamps.
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