... and replacement.2,Efficient and energy saving:Led bulb , Efficient constant-current drive circuit, The ... rate is as high as 90%, LED high-power bulb’s life is as long as 50, ... s very suitable for the occasions of frequent turn on/off and great voltage fluctuation range4,Environment-Friendly: Led bulb ... No Mercury.5,Short response time:Led bulb , it's very suitable for the occasions of frequent ...