Kolomzarov, Y., Kostylyov, V., Sorokin, V., Nikolaenko, Y., Pekur, D., Kornaga, V. and Korkishko, R. 2020. Environmental issues of lighting and prospects of energysaving LED lighting systems with combined power supply. Technology and design in electronic equipment. 5–6 (Dec. 2020), 3-9. DOI:https://doi.org/10.15222/TKEA2020.5-6.03.