Definition
Luminous range is the nominal range corrected for the prevailing meteorological visibility, taken from the luminous range diagram in the Admiralty List of Lights. A light of nominal range 20M may show only 8M in visibility of 3 miles, or over 25M on an exceptionally clear night. The distance a light is actually seen is the lesser of luminous and geographical range, unless loom or refraction extends detection beyond the horizon.
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