... year warranty 4.Free sample 12U high power energy saving lampQuality is always good, service ... year ! 1.High power factor:Power factor is more than 0.98, reactive power loss close to 0 ... 2.Energy saving 80% . 3.Constant power output:Power isn't changed by different voltage.4.High ... % Tri-phosphor, large capacity IC chip, ST mosfet, negative temperature coefficient magnetic components.11.No stroboscopic, ...