you can change from incandescent to led bulbs, but one thing you need to remember, our charging system (stator, regulator/rectifier) are designed to output full power all the time.
when you reduce the load someplace, unless you make up that load elsewhere, the r/r has to dump more power as heat, shortening its lifespan and possibly failing, and that may also cause the stator to fail as well.
Now, with a mosfet regulator/rectifier (aftermarket item), they are more efficient at managing the power, and can take the increased workload.
as far as 'heavy duty' or 'high output' stators for our bike, TPE is the only one doing them that I know of. and they are highly recommended and would recommend mosfet regulator at the same time.