[JennyHallu]

I believe the green light is inextricably connected to the Wight, and not to the Ring.

And I can prove it: I call your attention to that classic documentary of paranormal phenomena and the investigation thereof: Ghostbusters. It is quite clear throughout the film that several of the ghastly creatures captured on film emanate a green light, which is simply the natural color of the phosphorescent ectoplasmic slime they produce.