Standby Light

From International Dictionary of Marine Aids to Navigation
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A light installed permanently, close to the light in regular service, but operating independently from the latter and intended to be brought easily into service in the event of failure of the latter.

It may often be brought into service automatically.

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