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The subject of study was spatial analysis of transmission of visible light in water column of two deep suburban lakes during peak of summer. In vertical profiles of lakes correlations between transmission of blue/green light, photosynthetic active radiation (or PAR), temperature and oxygen content, chlorophyll a and physico-chemical features of water were analysed. Apparent and true depth of photic zone was investigated. The hypothesis was that vertical changeability of PAR limitation/transmission may be used as a...