Core Points - Shanghai has 862 parks that are open 24 hours, accounting for over 80% of its parks, but concerns about light pollution have arisen due to prolonged artificial lighting [1] - The city is promoting parks with light pollution control and healthy lighting, with Xujiahui Park being the first demonstration park for this initiative [1][2] - The innovative "flying saucer" lights in Xujiahui Park control light direction and intensity, minimizing light pollution while allowing for adjustable brightness and color temperature based on time and season [1][2] Group 1 - The design of the "flying saucer" lights includes a ring fixture that refracts light downwards, preventing uncontrolled light dispersion [1] - The brightness of the lights varies throughout the night, with the brightest times being from 6 PM to 6 AM, and dimming to 45%-51% of maximum brightness from 9 PM to 3 AM [1] - The color temperature of the lights changes from 4000 Kelvin at 6 PM to below 3300 Kelvin at night, providing a warm ambiance, and then increasing to 5000-6000 Kelvin before dawn [2] Group 2 - The park features a "seasonal mist" display that uses light and water mist to create a dreamlike atmosphere, adapting to seasonal changes [3] - Future enhancements include a "bullet screen" feature that projects various patterns and messages on the running track, aimed at engaging the community and enhancing the park experience [4] - The successful implementation of these lighting strategies in Xujiahui Park will serve as a model for other parks in Shanghai, with plans to develop design guidelines for broader application [4]