Not knowing MA law the only thing I could imagine that you would be up against would be total light surface area (3" round should be good here as a lot of large trucks have those lights from the factory) and having a reflector (be it built in or seperate). A lot of people forget about reflectors and that could technically be a citation down the road.
As for the technology.. Rich people pass laws. Rich people cars have LED ligths now. You'll be good on that end