A brief introduction:Light source development history

Artificial light source has a long history of development. According to archaeological data, dating back about 700,000 to 200,000 years ago, the Paleolithic Peking Man has started to fire for life, burrowing primitive to rely on the bonfire lighting, then gradually learned to use a torch. Of historical records, lamps found in the legendary Yellow Emperor, "Zhou" specially make fire or lighting office, forming oil lamp in the Warring States period, followed by the invention of candles. 1878 American inventor Thomas Edison invented the modern lamp (incandescent), and quickly be widely used in the world, the lamp was introduced into China in the early 20th century. Tubular fluorescent advent in the 1930s, soon to be widely used, and an important source of lighting. 1970s Philips invented the compact fluorescent lamps (CFLs), now also gradually been widely used. The human electric light began in the 18th century. Early 19th century, the United Kingdom H. David invented the carbon arc lamp. In 1879, TA Edison invented the practical value of the carbon filament incandescent mankind from a long fire lighting into the era of electric lighting. 1907 as drawn tungsten incandescent body. 1912, United States I. Langmuir inflatable incandescent, improve the efficiency of incandescent light emitting and the prolongation of life, incandescent expanded range of applications. The early 1930s, the successful development of low pressure sodium. 1938, Europe and the United States developed the fluorescent led highbay light

, the luminous efficiency and lifetime are more than three times the incandescent lamp, which is a major breakthrough in the technology of electric light. High-pressure mercury lamp in the 1940s entered the practical stage. The end of the 1950s, the advent of very small volume and light fades tungsten halogen lamp to change the stagnant state of thermal radiation light source technology progress, which is the light source technology as a major breakthrough. Developed in the 1960s, metal halide lamps and high pressure sodium lamps, the luminous efficiency is much higher than the high-pressure mercury lamp.80 there have been slim diameter energy - saving compact fluorescent lamps, low - power high - pressure sodium lamps and low power metal halide lamp, the light source into small, energy - saving and delivery of the new era.

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