... 2,Efficient and energy saving:Led bulb , Efficient constant-current drive circuit, The conversion>90%, In the same conditions, the ... stability:Led bulb , AC85V-AC265V 50/60Hz, The wide voltage and frequency input, without strobo flash, It's fast for transient response ... for the occasions of frequent turn on/off and great voltage fluctuation range.Others (price,package and service) :Quality Control: ...