... efficiency 3.80% energy saving 4.Longer lif Energy saving lamp half spiral Specification:1.voltage and frequency :220-240v ,50 ... % actual power ,100% tri-color powder fluorescent tube ,4.lamp base:PBT 5.lamp holder available:E14,E27,B22 6.color temprature:2700k ,6400k ... .Superiority :1.High luminous efficiency : 1 piece of energy saving lamp equal to 5 pieces of incandescent bulbs , 2. Instant start ...