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teepinna heleduse L ja sama punkti püsttasandilise valgustustiheduse Ev jagatis, ratio between the luminance, L, of a road surface and the vertical illuminance, Ev , at a specific location in a tunnel
contrast revealing coefficient . Valgustehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//valgus/contrast%20revealing%20coefficient/1/eng (04.07.2026)