... 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 ... 5.Can be widely used in T5,T8,T12,H Tube.6.The electronic ballasts have CCC,CE,RoHs,EMC ... THD less than 10% 77V-277V multi voltage electronic ballast