A very interesting topic! I've always loved discussing little details like this in The Lord of the Rings. Although I'm not completely sure where I stand in this, I am going to say that the glow is definitely connected somehow to the ghoulish Wight, as the similarities with the Dead Marshes, etc, have been pointed out.
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"Loud and clear it sounds in the valleys of the hills...and then let all the foes of Gondor flee!" -Boromir, The Fellowship of the Ring
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