... average about 20000Hrs.3.High power factor,Low THD ,the electronic ballast can work steadily when the voltage range varies from 160V ... -250V.4.The electronic ballast works in high frequency beyond 20KHZ,quietly, no negative effect ... in T5,T8,T12,H Tube.6.The electronic ballasts have CCC,CE,RoHsPower 1×40W Power factor 0.95 Electronic ballast For circle tube