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valgustuspaigaldise arvestuspinnale langeva valgusvoo ja valgustite individuaalsete koguvalgusvoogude summa jagatis, ratio of the luminous flux received by the reference surface to the sum of the individual total fluxes of the luminaires of the installation
utilance . Valgustehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//valgus/utilance/1/eng (06.07.2026)