Millions of years ago, when the first humans walked on the Earth, the sun was their only source of energy. The Sun gave them light, warmth, and later food crops.
Every night when the sun goes down, the world is dark.
Since then, humans have been looking for other ways to illuminate the world-from fire and torches to modern LEDs.
In the development of human lighting tools, there have been three major revolutions, respectively, the appearance and application of lamps, lamps and LED lamps. In ancient times, in order to defend the Beast and exorcise the darkness, humans coated the pine-gum or fat-like objects on the bark or wood chips and bundled them together for lighting torches. After meeting the basic needs of survival, people hope that the fire should be used in life, so people will be able to burn the grease into the container, add wick ignited, it became the originator of the oil lamp. The use of oil lamps, making the human's daily life extension of more than 2-3 hours, this is the first revolution in the history of human lighting.
The history of the use of oil lamps has been particularly long and the lamps have been improved many times, with oils from animal oils to vegetable oils, and then kerosene instead. The second revolution in human lighting was due to the advent of electricity. The advent of electricity has led to a leap in human productivity, and the invention of electric lights has also created a history of electricity-powered lighting for humans.
In the 1879, Edison lit the first real wide practical value of the electric light, the human race has officially moved to the era of electric lighting. In the electrical lighting stage, the development process of the lighting tools contains a variety of colorful electric lamps. Among them: The light bulb is also called the incandescent lamp, this is the earliest electric lamp. Only 10% of the input energy of an incandescent lamp is converted to visible light, the life span ranges from dozens of hours to thousands of hours and is still widely used; halogen lamps are improved on the basis of incandescent lamps, which are smaller than incandescent lamps and filled with heavier gas with high pressure, thus increasing the light efficiency and prolonging the service life The steam lamp is made up of various elements that are sealed in the glass tube and are illuminated by electricity.
Steam lamps commonly have high-pressure sodium vapor lamps, mainly used in road lighting. The third revolution of human lighting tools is the development of LED lights. Led development from 1907, British scientist Henry Joseph Round first observed electroluminescence in a piece of silicon carbide, and in 1962, General Electric (GE) Nick Holonyak invented the LED that could emit red light, 1972 George Craford invented the first orange-yellow light led;1993 first blue LED lights appear, to 1999 the first white LED lights appear, finally in the LED research and development field to develop close to natural light lamps, began to use for indoor lighting. LED has high efficiency, energy saving, long life, environmental protection and a series of advantages, is called the light of Hope.
LED energy-saving and environmental protection lamps, can make human life become more comfortable, healthy, convenient, is the essential green technology lighting revolution, but also after the incandescent light of human lighting history of another great revolution. In addition to developing energy-efficient, high-performance LEDs, we learned how to control light and develop a range of sensors, such as daylight sensors, sensor sensors and camera based technology.