This study analyzes a national fitness gym to incorporate a light-guiding system that uses natural light, supplemented with artificial lighting, to meet predefined standards. First, Ecotect software is used to simulate the lighting conditions at the gym's geographical location. Subsequently, an appropriate optical lighting system is selected, and the light distribution curve is modeled using TracePro software. Based on the site conditions, the required quantity and arrangement of the lighting system are calculated. In addition, indoor illumination variations under different outdoor lighting scenarios are simulated using DIAlux. To optimize the integration of natural and artificial lighting, the lamps' positioning is analyzed as a key influencing factor. Combined with the whale optimization algorithm, a response surface model is used to enhance the natural light compensation. Results indicate that this hybrid lighting approach satisfies horizontal illumination requirements while improving uniformity. Specifically, when the outdoor illumination reaches 19500 lx, four lamps can be eliminated; at 39500 lx, eight lamps can be removed; and at 49000 lx, artificial lighting becomes unnecessary.