... type: Base: iron and copper, alum for choosing in E27, E26, B22 ,E14 .Color tempreture: 2700K to 6400K Frequency: 50Hz . ... tube10.International certifications: ISO9001:2000,CE,ROHS;GS,CCC,QC, Energy Star etc. Why Choose Ebeteb Lighting?1. Our compact fluorescents ... use less electricity;2. Longer lifetime;efficient,energy saving up to 80% energy than incandescent bulbs; less pollution;3.High- ...