Humans Glow
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Spontaneous synesthetic aura perception is very rare, and I don't know if you can develop it later on, or if secondary "aura readers" percieve the second kind, or if a strong emotion can trigger the phenomenon is someone who usually doesn't percieve it.
There's nothing magical related to that.
Direct: http://www.livescience.com/health/090722-body-glow.html
We talk about a bride "glowing" on her wedding day. Perhaps that is not merely hyperbole. Perhaps it is something subtly perceived. And perhaps halos are also something subtly perceived. Saying that makes me think of expressions like "bringer of light" or "a light upon the world".
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I had a crazy Physics teacher :)