This is the Cool Lights CL-MB0150 CDM 150 ballast. It is the same ballast we use on our CL-MF0150 fresnels. You can buy them separately now as spares or for that tungsten to metal halide conversion project. Includes the ballast and 14 foot power cord. Input Voltage: 100VAC to 250VAC. Works with ceramic or quartz 150w metal halide bulbs.