Here are a couple of links to some tech info on magnetic HID ballasts and their application.
http://www.atlaslightingsupply.com/h...ting-guide.pdf
http://www.atlaslightingsupply.com/Ball_Tech_Info.pdf
I don't have anything on electronic HID ballasts. I do know some newer electronic ballasts are able to fire different
types of MH lamps, that is pulse start, probe start, ignitor start etc. but they still need to be
voltage matched to the lamps they are going to operate.