The relationships above are valid for only a few percent change of voltage around rated conditions, but they do indicate that a lamp operated at much lower than rated voltage could last for hundreds of times longer than at rated conditions, albeit with greatly reduced light output. The "Centennial Light" is a light bulb that is accepted by the Guinness Book of World Records as having been burning almost continuously at a fire station in Livermore, California, since 1901. However, the bulb emits the equivalent light of a four watt bulb. A similar story can be told of a 40-watt bulb in Texas that has been illuminated since <answer>21 September 1908</answer>. It once resided in an opera house where notable celebrities stopped to take in its glow, and was moved to an area museum in 1977.
When did the long-lasting bulb in Texas begin continuing illumination?
21 September 1908