What is the strange light that appears periodically at the Fukushima Daiichi site?
I've noticed in the past that the presence of this light correlates strongly with spiking radiation levels, as reported by Tepco. See here.
Horse, at the Enenews Webcam discussion forum, referred to the lights as some form of 'Brown's Gas Burner.' So, I researched Brown's Gas Burner. I also pulled up a comment about this technology made at Enenews over a year ago by a contributor who had worked with nuclear weapons during the Cold War. He went by handle of "the Blue Light."
Here is an interesting reference to Brown's Gas from my research: