I have no idea what the light could be. But its clearly that its the electromagnetic energy that's been talked about since season 1. But what if the light isn't electromagnetic energy, but just has electromagnetic energy. Its energy that his magnetic. This is the same energy that Dharma drilled into, and the same energy that the Swan was keeping at bay. it seems like The Light is so powerful that it has to be contained, or it could like destroy the world, or totally change it and everyone. Its the essence of life and death. What do you think it is? I would love to get into a discussion about it. :)

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