Ballast for HID lamps, sodium lamps, mercury lamps and metal halide lamps VS type Dimensions: 53 x Ballast for HID lamps, sodium lamps, mercury lamps and metal halide lamps VS type Dimensions: 53 x 66mm TW: 130 Type: 35w, 50w, 70w, 100w, 150w, 250w, 400w, 80w, 125w. Low power loss,no noisy,smart shape.