Abstract ：The luminous efficien is the key parameter of electric light sources energy2saving performance.
Abstract ：The luminous efficien is the key parameter of electric light sources energy2saving performance.
摘要:光效是电光源节能性能的关键参数。
Abstract ：The luminous efficien is the key parameter of electric light sources energy2saving performance.
摘要:光效是电光源节能性能的关键参数。