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
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 f40w/33-640/rs cool white made in germany
sylvania f30t8/cw cool white made in usa
ge f36t12-cw cool white usa