led发光效率如何看子弹型LED,口径10毫米,mcd值高达10 0000 电流20--60毫安1W LED 流明51.7-67.2lm 电流350mA1单位Lm等于多少mcd同等耗电下,那个效率高点,寿命那个长点,光衰那个大点子弹型LED,发射角8度,

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