How about a standard receptacle (NEMA 1,2,3 or Europlug) inside the frame where the ballast just plugs in. Then make a standard connector for each of various bulb types and combinations as ballasts are currently made for.
Yeah, multi-voltage ballasts would have a problem with that. Maybe a new multi-voltage receptacle design with a pin for each common voltage category? A 5-pin polarized connector should be sufficient for up to 277. Multi-voltage devices can have pins for supported voltages.
If only one hot line gets wired in the frame, then it would be safe for electronic ballasts to just connect all the voltage pins together, while multi-voltage magnetic ballasts can bring those to the appropriate inductor taps.
Last edited by pdh; 03/25/12 03:21 AM.