The design principle of lighting control systems in laying hen houses is based on a deep understanding of the impact of light on the reproductive endocrine mechanisms of laying hens. Photoperiod regulation technology effectively regulates egg production performance by artificially controlling the duration and intensity of light. The lighting control system mainly consists of three parts: a light source, a controller, and a timing device. The light source can use incandescent lamps, energy-saving lamps, or LED lamps, requiring adjustable light intensity and uniform light distribution. LED lamps have advantages such as energy saving, long lifespan, and a wide adjustable light range. The controller automatically adjusts the switching time and brightness of the light source according to a preset program, achieving precise control of the photoperiod. The timing device ensures the accuracy of the lighting program execution, usually synchronized with a clock to ensure consistent daily switching times. The layout of the lighting system needs to consider the structure of the hen house and the arrangement of cages to ensure uniform light intensity at each level of cages and avoid dark areas that could affect the flock's feeding and activity.

The regulatory role of photoperiod regulation technology in egg production performance is mainly reflected in two aspects: sexual maturity regulation and egg production maintenance. During the rearing period, the timing of sexual maturity in laying hens can be regulated by controlling the duration of illumination. A constant or gradually decreasing illumination scheme is typically used to prevent premature onset of egg production. Premature onset of egg production can lead to smaller egg weight, poor egg production persistence, and prolapse, affecting overall egg production performance. Increasing illumination time appropriately before the onset of egg production stimulates reproductive system development and promotes egg production initiation. During peak egg production, a longer illumination period, typically sixteen to seventeen hours, is required to maintain a high egg production rate. As the flock ages, illumination time can be appropriately extended or kept stable to delay the decline in egg production. Light intensity is equally important for egg production performance; excessive light can cause restlessness and increase the risk of pecking, while insufficient light inhibits feed intake and affects egg production.

The scientific application of illumination control systems significantly improves the production efficiency of laying hens. A stable photoperiod reduces stress responses in the flock, maintains normal feed, water, and activity rhythms, and is beneficial for digestion, absorption, and nutrient utilization. A well-designed lighting program can extend the duration of peak egg production, increasing the yield of qualified hatching eggs and marketable eggs. Light control can reduce stress caused by overcrowding, improve flock behavior, and reduce abnormal behaviors such as feather pecking and vent pecking. The energy-efficient design of the lighting system can reduce energy consumption, minimizing operating costs while maintaining production performance. In open-plan chicken houses, the lighting control system can automatically adjust artificial lighting according to changes in natural light, ensuring stable lighting throughout the year and overcoming the impact of seasonal variations on egg production. Through precise lighting control, egg farms can achieve stable and efficient egg production, resulting in better economic benefits.