There isn't a guidance method of evaluating luminous efficacy of light sources on road lighting yet resulted in the problem has not been solved at present.
由于目前国内尚缺乏定量地评价道路照明光源相对光效的指导方法，导致此问题一直悬而未决。
2
The solution for such problems will propose a theoretic guidance to urban light-scape design and lighting environment development in China.
对这些课题的深入研究和最终解决，将为我国的城市灯光景观和灯光环境建设提供理论上的指导。
3
Welcome friends to visit Yan Cheung Lighting Equipment co., Ltd., guidance and business negotiation.