Random question, folks. A friend of mine lost power in his house this past evening, yet his front porch light, an LED bulb, is still shining bright. Any idea why this might be? Do they sell bulbs with some sort of backup battery built in? Edit: Apparently the light on one of his power strips (the kind with a light-up switch) is still on, so we assume there is still some power coming in, just not enough to do anything other than light up a bulb or two. Thanks.