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valgustustihedus püsttasandi punktis, illuminance at a point on a vertical plane
püstpinnaline valgustustihedus . Valgustehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//valgus/p%C3%BCstpinnaline%20valgustustihedus/1/est (25.07.2026)