... you.20W,35W,70W,150W,250W for Metal Halide lamps with CE, ROHS,ISO9001 in China. Some of ballasts also ... =50/60HzEfficiency>89%Output current crest factor<1.2overload protectionyesshort-circuit protectionyesover warm protectionyes≥20000hours-15°C ~ +55°Cstorage temperature- ... . 4,Abnormal lamp automatically cut off the power 5, with overvoltage protection, to prevent a short time voltage surges and ...