The aim of the research was to examine the effect of the light color (yellow, green, blue and red) on the biomass production of microalgae Chlorella sp. under laboratory conditions. The changes in the content of total nitrogen, total phosphorus and total organic carbon were monitored in the culture medium. The increase in algae biomass was evaluated using the optical density measurements of the media at 686 nm and weight measurements. It was found that the spectral composition of light that illuminates the cultivation affects the production of algae biomass. The best results were obtained for those cultures illuminated with blue and red light. From the beginning of algae cultivation, 29 and 27% by weight decreases in the total nitrogen content and 98 and 94% by weight decrease in the total phosphorus content were obtained, respectively. During this time, the total organic carbon content increased by 45 and 38%, by weight and optical density increased to 1.42 and 1.13, respectively. In the cultures illuminated with blue and red light, microalgae biomass growth was at the level of 2.86 and 2.56 g/dm³.

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