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Light Fidelity (Li-Fi) in which light emitting diodes (LEDs) are used for data transfer is a promising alternative to Wireless Fidelity (Wi-Fi). Li-Fi systems use the visible light wavelength range (380-750 nm) of the electromagnetic spectrum. Therefore, lighting and data transmission can be carried out at the same time. In this paper, we made fundamental analysis of an indoor Li-Fi system using LED arrays by lighting and data transmission simulations. The simulation results showed that the examined Li-Fi system offers illumination and data transmission in accordance with the standards.