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sätestatud punktis paiknevale väga väikesele sfäärile langeva koguvalgusvoo ja sfääri pindala jagatis, total luminous flux falling on the whole surface of a very small sphere located at the specified point divided by the surface area of the sphere
spherical illuminance . Valgustehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//valgus/spherical%20illuminance/1/eng (27.07.2026)
