Incandescence Time (of a lamp)

From International Dictionary of Marine Aids to Navigation
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The time elapsing between the commencement of the supply of power to the lamp and the attainment of a specified percentage of the nominal luminous intensity or luminous flux of the lamp 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