%0 Journal Article %T RESEARCH OF TIME OF CRITICAL ILLUMINATION TO ASSESS THE DURATION OF DAYTIME ILLUMINATION %A Korkina, E.V. %A Shmarov, I.A. %A Voytovich, E.V. %K day lighting of premises of buildings, the light equivalent of solar radiation, artificial lighting, energy saving, intermediate light, critical outdoor natural illumination %J Bulletin of Belgorod State Technological University named after. V. G. Shukhov %D 2022 %N 7 %P 7 %I Belgorod State Technological University named after V.G. Shukhov