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lambi eluea antud ajahetke valgusvoo ja algvalgusvoo jagatis, ratio of the luminous flux of a lamp at a given time in its life to the initial luminous flux
lamp lumen maintenance factor . Valgustehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//valgus/lamp%20lumen%20maintenance%20factor/1/eng (08.08.2026)