... when the voltage range varies from 77V-277V.4.The electronic ballast works in high frequency beyond 20KHZ,quietly,no negative effect ... T5,T8,T12,H Tube.6.The electronic ballasts have CCC,CE,RoHs,EMC certificate.Power 2×40W Current 0.36AVoltage 220V Frequency ... 50/60HZPower factor 0.99 THD less than 10% 77V-277V multi voltage electronic ballast