Multiple inventors contributed to the incandescent light bulb before Thomas Edison and Joseph Swan commercialized it. Historians Robert Friedel and Paul Israel concluded that Edison's version was the first practical implementation because it combined an effective incandescent material, a high vacuum, a high-resistance filament, and a complete system of electric lighting. Joseph Swan's bulb predated Edison's and was installed in daily use in London in 1881.
When did Joseph Swan first publicly demonstrate the incandescent light bulb?
Joseph Swan first publicly demonstrated his incandescent lamp on the 3rd of February 1879 at the Literary and Philosophical Society of Newcastle upon Tyne, where 700 people attended. His house, Underhill in Low Fell, Gateshead, became the first home in the world to be lit by a lightbulb.
How long did Thomas Edison's first successful incandescent bulb test last?
Edison's first successful test ran on the 22nd of October 1879 and lasted 13.5 hours. His team later discovered that a carbonized bamboo filament could last more than 1,200 hours.
Why are incandescent light bulbs so inefficient?
Less than 5% of the energy consumed by a typical incandescent bulb is converted into visible light; the rest is released as heat in the near-infrared wavelengths. A typical 120-volt incandescent bulb achieves about 16 lumens per watt, compared with 60 lumens per watt for a compact fluorescent and 100 lumens per watt for typical white LED lamps.
What was the Phoebus cartel and how did it affect incandescent light bulb lifetimes?
The Phoebus cartel was an agreement among major bulb manufacturers, active between 1924 and the outbreak of the Second World War, that fixed prices and sales quotas and secretly limited bulb life to 1,000 hours, down from earlier designs rated for up to 2,500 hours. When the arrangement was exposed in 1953, General Electric and other leading American manufacturers were banned from continuing to limit bulb life.
What is the Ribbon Machine and how did it change incandescent bulb production?
The Ribbon Machine was a bulb-blowing machine installed by Corning Glass Works in its Wellsboro, Pennsylvania factory in 1926. Invented by William Woods and his colleague David E. Gray, it was producing 1,000 bulbs per minute by 1939 and could produce between 50,000 and 120,000 bulbs per hour depending on bulb size. By the 1970s, 15 ribbon machines around the world produced the entire global supply of incandescent bulbs.