LED, do you know the history of the development of road lighting? ......

According to U.S. media reports, there are 55 million lights in the United States on the road today, to provide lighting for 250 million cars. Lighting brings great changes to the human.

So, you understand the history of the development of road lighting? The ancient street lighting to what? Next, let us through the 10 landmark events to introduce the history of street lighting!

1. in ancient Rome, with rich plant lamp to illuminate the front door. There are special slaves, and watch the lights off for lighting.

2.1417 years, the mayor of London ordered all families have to hang lanterns outdoors in the winter night. This is the first time the government organized public street lighting.

3.1802 years, Scotland inventor William Murdoch (William Murdoch) launched a campaign to more efficient street lighting. His gas lights outside the SOHO foundry, to show to the public. Five years later, London has the first gas street lighting.

4.1816 years, Baltimore became the first city in the United States with natural gas street lighting installation. In 1820, Paris followed.

5.1878 years, Paris installed the world's first electric arc lamp. Three years later, the installation of 4000 lamp arc lamp, effectively replace the installed in the lamppost on the lamp.

6.1879 years, Edison successfully made with carbon fiber as a filament for the incandescent light bulb, change the world, to promote the development of lighting for street lamp.

7. low pressure sodium lamp invented in Europe in 1930s. The lamp comprises a movable outer insulating layer and a vacuum, using low pressure sodium vapour discharge light.

8. American Nick Holonyak Jr. in 1962 developed the first practical visible light emitting diode (LED).

9.1965 years, the United States launched GE high pressure sodium (HID), compared with the low pressure sodium lamp, with superior color and efficiency. At present, the HID lamp is still the most common type of lights on the earth.

10. now LED longer life, better light, use less than HID lamp energy. Although a few years ago LED accounted for only a small part of the street, but the pace is rapid.

Since ancient times Rome, we have come a long way. Moreover, due to the rapid rise of the LED, HID street may soon be like those lights before will disappear. (compiled: LED James)

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