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  2. Phoebus cartel - Wikipedia

    en.wikipedia.org/wiki/Phoebus_cartel

    The cartel lowered operational costs and worked to standardize the life expectancy of light bulbs at 1,000 hours [6] (down from 2,500 hours), [6] while raising prices without fear of competition. The reduction in lifespan has been cited as an example of planned obsolescence. [7]

  3. Longest-lasting light bulbs - Wikipedia

    en.wikipedia.org/wiki/Longest-lasting_light_bulbs

    The fifth-longest-lasting light bulb was located in a fire house in Mangum, Oklahoma. It was installed circa 1926–1929. The bulb was not attached to any special electrical supply, and when the power went off, so did the bulb. [2] The firefighters in Mangum were willing to show visitors the light bulb as long as they were not busy with ...

  4. Electric light - Wikipedia

    en.wikipedia.org/wiki/Electric_light

    Life expectancy for many types of lamp is defined as the number of hours of operation at which 50% of them fail, that is the median life of the lamps. Production tolerances as low as 1% can create a variance of 25% in lamp life, so in general some lamps will fail well before the rated life expectancy, and some will last much longer.

  5. LED light bulb maker misled consumers, FTC says - AOL

    www.aol.com/news/2010-09-14-led-light-bulb-maker...

    A California light bulb maker has been accused of misleading consumers about the brightness and use expectancy of its LED bulbs in a suit filed by the U.S. Federal Trade Commission. The FTC claims ...

  6. Incandescent light bulb - Wikipedia

    en.wikipedia.org/wiki/Incandescent_light_bulb

    The trade-off is typically set to provide a lifetime of 1,000 to 2,000 hours for lamps used for general illumination. Theatrical, photographic, and projection lamps may have a useful life of only a few hours, trading life expectancy for high output in a compact form.

  7. Centennial Light - Wikipedia

    en.wikipedia.org/wiki/Centennial_Light

    The bulb is cared for by the Centennial Light Bulb Committee, a partnership of the Livermore-Pleasanton Fire Department, Livermore Heritage Guild, Lawrence Livermore National Laboratories, and Sandia National Laboratories. The Livermore-Pleasanton Fire Department plans to house and maintain the bulb for the rest of its life, regardless of length.