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osa valgusallika valgusvoost, mis aitab valdavalt kaasa valgustusülesande täitmisele, part of the luminous flux of a light source that contributes predominantly to the lighting task
kasulik valgusvoog . Valgustehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//valgus/kasulik%20valgusvoog/1/est (08.07.2026)
