... 80% energy saving 4.Longer lif Energy saving lamp half spiral Specification:1.voltage and frequency :220 ... ,15w,18W,3.85% actual power ,100% tri-color powder fluorescent tube ,4.lamp base:PBT 5.lamp holder ... .High luminous efficiency : 1 piece of energy saving lamp equal to 5 pieces of incandescent bulbs , 2. ... 3. long life : 1 piece of energy saving lamp equal to 8 pieces of incandescent bulbs ,4. ...