... ,35W,70W,150W,250W for Metal Halide lamps with CE, ROHS,ISO9001 in China. Some of ballasts ... low coefficient 3,Electromagnetic radiation is too power to effect the around electrical equipment working.HLB ... lamp automatically cut off the power 5, with overvoltage protection, to prevent a short time voltage surges and ... Selling 250W MH/HPS Electronic Ballast from Shenzhen, Manufacture can be Customized