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väärtus, millest allapoole sätestatud pinna keskmine heledus ei tohi langeda, value below which average luminance should not fall
heleduse hooldeväärtus . Valgustehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//valgus/heleduse%20hooldev%C3%A4%C3%A4rtus/1/est (15.07.2026)
