The 1930s saw widespread domestic usage of electric light including early incarnations of the headlamp.Now electric light is widely used in our country. It is useful in many ways. For example, we can reading book in the night with light. Some big lamp can be used to heat。
The 1930s saw widespread domestic usage of electric light including early incarnations of the headlamp.Now electric light is widely used in our country. It is useful in many ways. For example, we can reading book in the night with light. Some big lamp can be used to heat。
The invention of electric light
Before the advent of the electric light, the widespread use of lighting tools candles, kerosene or gas lamps. September 1878, Edison invented the electric light decision. He read a lot of books on electric lighting, determined to create a cheap, durable, and safe and convenient lamp. Edison made the light carefully summed up the failure of previous experience, to develop a detailed test plan。In 1879, after several experiments, Edison finally decided to make carbon wire filament. Electric light the most famous is a 19th century invention, Edison is also the most brilliant contributions to mankind.
On one occasion, his mother a disease, therefore, Edison got a doctor : is your mother have appendicitis, surgery, must turn, then, he is very much at home from the hospital, but soon the darkness Edison moved brains, and cabinets on the chant. put a large mirror on the cabinet, therefore, a mirror reflecting light to save his mother, the doctor moved to say : "You save your mother, your mother, your life is to again! Thus, out of the Edison Electric!。
The invention of electric light
Before the advent of the electric light, the widespread use of lighting tools candles, kerosene or gas lamps. September 1878, Edison invented the electric light decision. He read a lot of books on electric lighting, determined to create a cheap, durable, and safe and convenient lamp. Edison made the light carefully summed up the failure of previous experience, to develop a detailed test plan。In 1879, after several experiments, Edison finally decided to make carbon wire filament. Electric light the most famous is a 19th century invention, Edison is also the most brilliant contributions to mankind.
The Characteristics of LED illumination
Fifty years ago,the huminality had already known the basic knowledge of semiconductor material
can produce light,The first commercial diode produced in 1960.LED is short for light emitting
diode(LED),its basic structure is an electroluminescent semiconductor material
,placed on the a stand with down-lead,and then sealed with epoxy resin around in order to protect internal batteries,so the aseismatic capability of LED is good。The advantages of LED illumination
1.Security:LED is supplied by low-voltage power,so it is safer than supplied by high voltage
power,it is particularly applicable to public.
2.Economy:compared with the incandescence lamp the energy consumption reduces 80%
3.Applicability:convenient apply,each unit of LED snippet is 3-5mm square,it can be prepared
into various shaped devices,and suitable for the inconstant environment.
4.Stability:it can work 100000 hours,the light decay is 50 percent of the initial.
5.Response time:fincandescence lamps base on millisecond,the LED base on nanosecond.
6. Environment protection:no harmful metal mercury.
7.Color:changing the electric can change the color,the light_emitting diode easily adjust the energy band structure and the band gap through chemical modification,adjustment of the energy band structure and the band gap and achieve multicolor luminescence.For example,withsmall current at the LED is red,but with the current increase,it will turn into orange,yellow.and green finally.
8.Lifespan:the expectancy of LED is more than incandescence lamp,it is more than ten times
as an ordinary incandescence lamp.
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