短語詞組短語efficiency utilization of light 光能利用率efficiency of focusing light 聚光效率utilization efficiency of light 光能利用率efficiency of light source 光源效率efficiency of light utilization 光照利用率efficiency of light energy conversion 光能轉化效率Light output efficiency of light 燈具出光效率efficiency of source of light 光源效率efficiency of light energy utilization 光能利用率 返回 efficiency of light