... Product Description.Electromagnetic ballasts for metal halide lamp,sodium lamp,mercury lamp 35W,70W,125W,150W,250W,400W, ... halide) discharge lamp; HM:(high-pressure mercury vapour) discharge lamp.1) Main voltage:220V-240V.2) Main frequency:50 ... .6) Low magnetic leakage.7) Watts:35W,50W,70W,100W,125W,150W,250W,400W,600W,700W ... us, we will reply you within 24 hours. MH metal halide lamp 250w ballast