The history of the develpment of lights

The earliest practical electric lamp is the incandescent lamp. However, long before the advent of the incandescent lamp, Humphry Davy, an Englishman, made arc lamps with 2000 batteries and two carbon sticks. However, such arc lamps are too bright and produce too much heat and are not durable, so they cannot be used in ordinary places.

In 1854, Henry Gerber, a German watchmaker who immigrated to the United States, made the first functional electric light from a carbonized bamboo stick placed in a vacuum glass bottle. It lasted for 400 hours, but he did not apply for a patent soon enough.

In 1860, The Englishman Joseph Swan also made a carbon filament electric lamp, but he could not get a good vacuum environment to keep the carbon filament working for a long time.

In 1878, when British vacuum technology was developed to the point where it was needed, he invented a light bulb powered by carbon wires in a vacuum and obtained a British patent. Mr Swan's own house was the first private home in Britain to be electrified.

In 1874, two Canadian electricians applied for a patent for an electric light that would glow from an electrified carbon rod by filling a glass bubble with nitrogen gas, but they could not afford to continue perfecting the invention.

Sold the patent to Edison in 1875. Edison bought patents and tried to improve the filament, eventually producing a carbonized bamboo lamp that would last 1,200 hours in 1880.

However, the United States Patent Office ruled that Edison's invention of the carbon filament incandescent lamp fell into human hands and the patent was invalid. After years of legal battles, Henry Goebbels won the patent, and Edison eventually bought it from Goebbels's impoverished widow.

In England, Swann sued Edison for patent infringement, and they settled out of court to set up a joint company in England in 1883. Swan later sold his shares and patents to Edison.

At the beginning of the 20th century, carbide filaments were replaced by tungsten wires, which are still used today.

In 1938, fluorescent lamps were introduced. In 1998 white LED lights were born.