... service offer Professional 8W T5 electronic ballast ------------SpecificationsT5 electronic ballastVoltage: 110V/220VPower type: 14w, 21w, 28w, 35w, 54w, 2*14w,2 ... current and voltage protection ,extended the life of the fluorescent lamp.3. Super energy saver, PF: >0.98, THD<20%.4 ... whole production process. --------------- 1*28wt T5 electronic ballast for fluorescent lamp