I have read here and there that new appliances will, or are, being built with like a transponder ID in them that identifies what it is by a factory ID. Electric oven fires up, it sends to the smart meter, "I am an electric oven, built by XXXX, max wattage is XXX. Same for other items. I am a TV, I am a dryer, I am a dishwasher.
This really won't mean much for a decade or two until all existing appliances wear out and need to replaced. After that, every electrical item could be ID'd with start and stop times. The question is will the ballast makers be forced to also include the transponder that says, "I am a MH or HPS light"...or not install anything and the meter could see it as an "Unidentifiable device"?