Exactly how ridiculous would it be to create the flux needed to use this to modulate our star? Or what about some other star? Could it be used as a means of c

Exactly how ridiculous would it be to create the flux needed to use this to modulate our star? Or what about some other star? Could it be used as a means of communication? Sure, other means are easier but this would be visible even to a very low tech civilization and people who had nothing better to do used to watch the stars a lot. I'm guessing we're several orders of magnitude away from the kind of flux that could do that sort of thing, but I have to wonder...