Light fidelity (Li-Fi) is an emerging optical wireless communication technology that utilizes visible light for high speed data transmission, addressing the limitations of traditional radio frequency (RF) based systems such as Wi-Fi and 5G. Given the increasing demand for wireless data and the congestion of RF spectrum, Li-Fi offers a promising solution by leveraging light-emitting diodes (LEDs) for simultaneous illumination and communication. This study evaluates the performance of a Li-Fi system through extensive simulations, analyzing key metrics such as quality factor (Q-factor), bit error rate (BER), eye diagram, and coverage area. The results indicate that the system supports a data rate of 10 Gbps up to a height (i.e., range) of 6.5 m when operating at a beam divergence angle of 523.59 mrad (i.e., \(30^\circ \) ), achieving a Q-factor of 6.59 and a coverage area of 46.69 m \(^{2}\) . However, as the transmitter height increases, BER rises while Q-factor declines due to free-space losses and signal dispersion. A higher divergence angle enhances coverage but demands increased transmission power for maintaining signal integrity. At 6.5 m and 523.59 mrad, the system achieves a BER of 2.15 \(\times \) \(10^{- 11}\) with a transmitted power of 3 W, confirming its feasibility for high-speed indoor communication.