... average about 20000Hrs.3.High power factor,Low THD ,the electronic ballast can work steadily when the voltage range varies from 77V ... -277V.4.The electronic ballast works in high frequency beyond 20KHZ,quietly,no negative effect ... .Can be widely used in T5,T8,T12,H Tube.6.The electronic ballasts have CCC,CE,RoHs,EMC certificate.Power 2×40W Current ...