... lampholder4, Electronic ballast--four configuration for choice: A) IC Standard with chip, PF≥0.99, THD<15%, life time ... .50/60Hz,pre-heating and EOL function B) TUV Standard, PF≥0.97, THD<15%, life time is 20,000h, 220 ... -240V,50Hz C) Ordinary Standard, PF≥0.95, THD<30%, life ... tim is 15,000h,220-240V,50Hz D) Low Standard, PF≥0.55, life time is 15,000h, 110V/ ...