Nigrescence Time (of a lamp)

From International Dictionary of Marine Aids to Navigation
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The time elapsing between the cessation of the supply of power to the lamp and the decrease of luminous intensity or luminous flux of the lamp to a specified percentage of the nominal value at the given power level.

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