I myself am not sure what the green light was, however, I have reason to believe it had something to do with the wight. Here is an exerpt:
'But the courage that had been awakened in him was now too strong: he could not leave his friends so easily. He wavered, groping in his pocket, and then fought with himself again; and as he did so the arm crept nearer. Suddenly resolve hardened in him, and he seized a short sword that lay beside him, and kneeling he stooped low over the bodies of his companions. With what strength he had he hewed at the crawling arm near the wrist, and the hand broke off; but at the same moment the sword splintered up to the hilt. <u>There was a shriek and the light vanished. In the dark</u> there was a snarling noise.'
--I, pp. 152, 153
There you see the light vanishing when the wight is injured and retreats. I still don't really know anything for sure, but it does seem like the light is connected with the wight. Hope this is some kind of help.
Jes
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