I garbagepicked a 750 MH HID that was a tennis court style light in rolled steel with SAG glass and a faceted reflector. After about 3 weeks it stopped fully lighting the bulb. After much troubleshooting with tech support from Graybar Electric, Grainger, etc. it was eventually determined that the capacitor had failed not the ballast. Now because this setup 750w is not common everything associated was $$$, the bulb, the ballast and the capacitor. So I gave up and scavanged the reflector and the mogul base for an MH ballast kit I purchased. Long story short, HID is not a mix and match situation.