I was doing a repair on a homeowner installed low voltage lighting system. I at first couldn't figure out why there were no lights working. First I checked the transformer for juice, then output, then the lines and finally the fixtures itself. I went to pull out the bulb, the first thing I noticed that it was black(like burned) but I know it was working because it burnt the heck out of my index finger. The question would be why would a bulb burn from the inside causing no light to be emitted? The only thing that I can figure is it probably could do with the spider webs that I cleaned out of the fixtures.