Daylight Control

From International Dictionary of Marine Aids to Navigation
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Alternative term: Sun Relay, Sun Switch

A device, operated by daylight, that automatically lights and extinguishes an electric light, usually lighting it at or about sunset and extinguishing it at or about sunrise.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM