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In this paper, we study energy-efficient precoding techniques in multiuser multiple-input single-output (MISO) visible light communication (VLC) systems. Under the dual constraints of illumination and communication, an optimal precoding design is proposed for a 4 × 2 multiuser MISO VLC system by utilizing the properties of Farey sequence in number theory. It is proved that the received signals constitute a sizeable pulse amplitude modulation constellation and thanks to this nice constellation structure, low-complexity maximum likelihood detection is admitted for signal detection. The simulation results indicate that our proposed optimal precoding design outperforms zero-forcing and time-division multiple access schemes.