CWF光源为美国冷白商店光源(Cool White Fluorescent) 色温：4150K ，美国客户常用；公司代理品牌有：飞利浦 PIHLIPS，奇异GE，喜万年 SYLVANIA等。GE F20W/33-640 COOL WHITE Made in HungaryGE F40W/33-640 COOL WHITE Made in HungarySYLVANIA F20T12/CW, Made in CanadaPHILIPS TLD 18W/33SYLVANIA F20T12/CW Cool White USASYLVANIA F20T12/CW Cool White CanadaSYLVANIA F20W/33-640/RS COOL WHITE Made in GermanySYLVANIA F40W/33-640/RS COOL WHITE Made in GermanySYLVANIA F30T8/CW Cool White Made in USAGE F36T12-CW COOL WHITE USA