Translation: I’ve come up with a brilliant idea.
Obviously, this can also be una idea brillante.
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It seems that the two are very close, with brillante referring to something that is shiny, sparkly, bright - which can be what you mean by a “brilliant idea”. But then there is genial, which is masterly - also how you might describe your brilliance. My primary language is English, and I have to say that I have learned a lot about my own language during my Spanish learning experience. Taking a closer look at the meaning of words is very interesting. Thanks for the poke!