In this paper, we propose a technique called joint power allocation and orientation of light-emitting diodes (LEDs) to improve the illuminance quality of an indoor visible light communication (VLC) system. The optimization problem for LEDs, considering power allocation coefficients and normal vectors, is solved through an iterative algorithm. The simulation results with various LED geometries show that the proposed scheme can achieve a lower received power variance and a higher quality factor compared to previous power allocation schemes.