I want to respond to the 2006 story called "Unexplained Light" by Michelle. I had a similar experience.
It was around 2008, near Stockport, Ohio. I awoke in the night to see a flickering green light coming from outside. I got up and went to the greenhouse adjacent to the house. It was fully illuminated with the light. Because of the flickering nature of the light, I had the thought that perhaps the garage at the top of the hill was on fire, so I ran up there to see.
Once on high ground, I could see that not only was the garage not on fire, but nothing else was either. I could see a great distance in any direction, clearly making out my neighbor's house a hundred yards away, the tree lines, the water tower in the distance.
The landscape was illuminated to the extent that might be done with a bright full moon on a very clear night. But the moon wasn't out at all, and the sky was cloudy. Also, there were no shadows created by the light, and the light flickered like a fire was creating it.
As I was going back down to my house, the light went off, like someone had turned it off with a switch. Without the light, there was near total darkness. I had to be careful where I was walking. Before I got to my house, the light "switched" back on instantly, stayed on another 20 seconds or so, and "switched" off again.
Later in the night, I woke up to see that it was on yet again. My take on it is that somehow the clouds were creating the light by discharging static electricity (hence the flickering). Normally, this happens suddenly and we see lightning. Perhaps the discharge was happening slowly that night, creating the equivalent of a natural fluorescent light.