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Päikeselt praktiliselt paralleelsete kiirtena saabuv kiirgus
otsene päikesekiirgus . Valgustehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//valgus/otsene%20p%C3%A4ikesekiirgus/1/est (02.08.2026)