... certificate. 1.Full spiral energy saving lamp 2.Good quality, 3Good service, 4.Good price 5.CCC,CQC,CE,ROHS,ISO9001:2000 certficate 1.full spiral energy saving lamp,energy saving lights ... ,CFL,compact fluorescent lamp2.Diameter:17mm2.Energy saving 80%3.Longer life time 8000hours ...