This study proposes a supplementary lighting and regulatory scheme for application in semi-closed crop production systems. This supplementary lighting control module is primarily based on fuzzy logic inference and an expert database. Under the hypothesis that the temperature and humidity conditions are consistent, the system will implement supplementary lighting of different wavelengths according to current solar spectral distribution conditions and plant growth patterns. Simulations demonstrate that under the condition of full sunlight, the system still provides supplementary light to compensate for insufficient light spectrum. Compared to traditional plant lamps that need to be lit for long periods of time, this system can randomly adjust light spectrum and intensity to achieve energy savings, and is therefore suitable for application in lighting control systems in future greenhouses.