The three revolution of human lighting: LED third

Millions of years ago, when the first humans walk the earth, the sun is the only source of energy. The sun gives them light, warmth, and later grain crops. Every night when the sun, the world is dark.

Since then, people have been looking for other ways to illuminate the world -- from the fire and the torch, to the modern LED.

In the process of development of human lighting tools, has experienced three major revolutions, respectively is the appearance and application of lamp, lamp, LED lamp.

In ancient times, in order to defend the beast, the darkness, the human kind of fat or turpentine on bark or wood, tied together, made for the lighting of the torch. To meet the basic survival needs, people hope the fire for life, so people will be the burning of oil into the container, add the wick ignited, became the originator of the lamp. The lamp is used, which makes human time was prolonged for 2-3 hours, this is the first time the revolutionary history of lighting. The history of human use of lamp lighting lamp particularly long, through a number of improvements, lamp oil from animal oil to vegetable oil, and finally replaced by kerosene.

The second revolution of human lighting tool is from electricity. The appearance of electricity makes the human productivity leap, and with the invention of the electric light, creating a human history of electricity for lighting. In 1879, Edison lit the first light really has extensive practical value of human light, toward a formal electrical lighting era.

In the stage of development of electrical lighting, lighting lamps and lanterns of various electric tools contains rich and colorful. The electric light bulb or incandescent lamp, this is the first light. Only 10% of the input energy of the incandescent lamp into visible light, life from dozens of hours to thousands of hours, now is still in widespread use; halogen lamps, incandescent lamp is improved on the basis of the volume is smaller than the incandescent lamp, and the heavier gas which filled with high pressure, thus improving the light efficiency. And prolong service life; vapor lamp is composed of a sealing elements in the glass tube in the steam is energized to light. There is a common vapor lamp high pressure sodium lamp, mainly used in road lighting.

Human lighting tools of the third revolution is the development of LED lamps. The development of LED from 1907, British scientist Henry Joseph Round for the first time in a piece of silicon carbide in the observed luminescence phenomenon began in 1962, the U.S. Ge Corp (GE) Nick Holonyak of the invention can emit red light LED, 1972 George Craford invented the first orange light LED; 1993 first light blue LED lamp to appear; 1999 the first light white LED light, culminating in the LED research developed a lamp close to natural light, for indoor lighting. LED has a series of advantages of high efficiency, energy saving, long life, environmental protection, known as the light of hope. LED energy-saving lamps, can make human life more comfortable, healthy, convenient, green lighting technology revolution of human essential, but also following the incandescent lighting in the history of mankind since another great revolution.

In addition to the development of energy saving, high performance LED, we have also learned how to control the light, developed a series of sensors, such as fluorescent sensors, sensor and camera based technology.

The future is bright. (Editor: LED James)

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