喜万年看色cwf灯管f20w/33-640/irs冷白光灯管
cwf灯管为美国冷白商店光源(cool white fluorescent) 色温：4150k ，美国客户常用；公司经销品牌有：飞利浦 pihlips，奇异ge，喜万年 sylvania等。
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