"After this communication, I saw the light in the room begin to gather immediately around the person of him who had been speaking to me, and it continued to do so until the room was again left dark, except just around him; when, instantly I saw, as it were, a conduit open right up into heaven, and he ascended till he entirely disappeared, and the room was left as it had been before this heavenly light had made its appearance."
Joseph Smith—History 1:43
This is Joseph Smith's description of the departure of an angel he had been speaking with... or listening to, at least. I am not sure how much dialogue went on. I find his description of the light fascinating... his first vision account talks about a pillar of light descending gradually... and it reminds me of D&C 93 where it says "The glory of God is intelligence, or, in other words, light and truth" ... and that we all started out as intelligences. I wonder if the angel is just so filled with light and truth that he shines. :) In the Old Testament there is the story of Moses coming back from talking with the Lord and the Israelites were afraid of him because his face shone... (Exodus 34:28-35)... so, it could be that being around God makes you shine. :) Anyway, it is interesting, and cool... someday we will probably all be filled with light and shine like that. Won't that be amazing?