喜万年CWF灯管F40W/33-640/RS F20W/33-640/IRS
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 Hungary
GE F40W/33-640 COOL WHITE Made in Hungary
GE F20T12-CW-ECO 20W USA
PHILIPS TL-D 18W/33-640 Made in Poland
PHILIPS TL-D 30W/33-640 Made in Poland
PHILIPS TL-D 36W/33-640 Made in Poland
SYLVANIA F20T12/CW Cool White USA
SYLVANIA F20T12/CW Cool White Canada
SYLVANIA F20W/33-640/RS COOL WHITE Made in Germany
SYLVANIA INSTANT RAPID START  F20W/33-640/IRS Cool White
SYLVANIA F40W/33-640/RS COOL WHITE Made in Germany
SYLVANIA F30T8/CW Cool White Made in USA
GE F36T12-CW COOL WHITE USA