... spiral energy saving lamp 2)Voltage: 110 - 130V, 220 -240V.Frequency:50/60Hz 3)Light efficiency:60Lm/watt.4)Life:8000H half spiral energy saving ... Light efficiency:60Lm/wattLife:8000HoursUp to 80% energy saving---- Different Lamp for different marketOEM acceptedCertificate : CE, EMC , UL ,ROHSPassed standard : ISO9001 half spiral energy saving lamp