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13 hours
- The big breakthrough finally came in October 1879 when a high-resistance, carbon filament burned continuously for more than 13 hours.
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Nov 22, 2013 · By October 1879, Edison’s team had produced a light bulb with a carbonized filament of uncoated cotton thread that could last for 14.5 hours. They continued to experiment with the filament until settling on one made from bamboo that gave Edison’s lamps a lifetime of up to 1,200 hours -- this filament became the standard for the Edison bulb ...
Oct 21, 2024 · October 21, 1879. Thomas Edison perfects the first commercially practical incandescent light bulb. Using a filament of carbonized cotton thread, his first attempt at this design results in a bulb that lasts about 13.5 hours before burning out. He later extends the life of the bulb to 40 hours.
Dec 17, 2014 · In the ensuing four decades, however, numerous inventors failed to produce a safe, bright and affordable bulb that could stay lit for more than a few minutes at a time.
Oct 21, 2009 · Soon, the lab got a carbon-filament bulb to last 40 hours. It had cost $40,000 (about $850,000 in today's money) and taken 1,200 experiments, but was ready at last for a public debut.
- Randy Alfred
Apr 1, 2021 · With the passage of time, in order to increase the lifespan of the incandescent light bulb filament, an inert gas enclosed in a glass jar was used. Although the incandescent light bulb was a major leap over the carbon arc lamp, as it offered better lightning performance, and lifespan.
But it wasn't until more than a year later, on the morning of October 22 (after working all through the day of October 21, 1879) that Thomas Alva Edison and his team finally “perfected” the incandescent light bulb.
Mar 13, 2018 · Edison was able to produce over 13 continuous hours of light with the cotton thread filament, and filed his first light bulb patent on January 27, 1880. Later, he and his researchers found that the ideal filament substance was carbonized bamboo, which produced over 1,200 hours of continuous light.
