Narya was given to Gandalf by Cirdan to free the hearts of Middle Earth. But if the other two elvish rings had power to protect their relevant realms, maybe Narya could protect the Grey Havens.
I belive I read somewhere that the light came from within Gandalf.
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I go to my fathers. And even in their mighty company I shall not now be ashamed. I felled the black serpent. A grim morn, and a glad day, and a golden sunset!
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