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pinnaelemendi antudsuunalise heleduse ja sama elemendi valgustustiheduse jagatis, quotient of the luminance of a surface element in a given direction by the illuminance on the surface element
heledustegur . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/heledustegur/1/est (10.07.2026)
