Useful Life (of a lamp)

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2-3-445

The length of time during which the luminous flux emitted by the lamp exceeds a specified proportion of its initial value.




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

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[[Category:2.3 Light Sources]

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

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