Edison invented the electric light bulb to make mankind bid farewell to darkness and enter the light. The first electric bulb is what we call incandescent lamp. The efficiency of the incandescent lamp is very low, and only about ten percent of the energy is converted into light energy, and the rest of the energy is converted into heat and vanishes in the air. With the progress of the times, energy-saving lamps have been invented by people, energy-saving lamps. Energy saving lamp is convenient to make, cheap, more energy saving and brighter than incandescent lamp, so it has gradually replaced incandescent lamp and became the main choice of indoor lighting. LED lamp is a new lighting method in recent years. LED lamp is a technical advance than energy-saving lamp. It can be said that LED is the development direction of future lighting
Compared with traditional light source, what are the advantages of LED light source?
As a light-emitting device, LED has attracted much attention and has its advantages over other luminescent devices.
The LED has the following advantages:
(1) Long working life: LED as a conductor solid luminescent device has a longer work than other luminescent devices.
Life. Its brightness half-life is usually up to 100,000 hours. If LED replaces the traditional car lamp, then its life will be far greater than the life of the automobile body, and has the characteristics of not needing to be repaired and replaced for life.
(2) Low power consumption: LED is a low-voltage working device, so the minimum power consumption can be greatly reduced under the same brightness.
The energy consumption. On the contrary, with the development of technology and materials in the future, it will have higher luminous efficiency. People have calculated that if Japan's lighting fixtures were replaced by leds, two large power plants could be reduced, which would be beneficial to environmental protection.
(3) Fast response time: the LED can generally respond within tens of milliseconds (ns), so it is a kind of telling device, which is also.
Other light sources. LED production of high - level brake lights in high - speed state, greatly improved the safety of the car.
(4) Small size, light weight and resistance: this is the inherent characteristic of semiconductor solid devices. Color LED can make all kinds.
A clear and refined display device.
(5) Easy to move light, color, control: LED as a light-emitting device, can pass through the current changes in the control brightness, can also be accomplished by configuration of different wavelengths LED color change and adjustment. Therefore, it is easy to use the light source or the display screen made of LED to achieve the needs of various applications through electronic control, and the compatibility with IC computer is extremely difficult. In addition, the application of LED light source is not limited by the space in principle, and is extremely plastic, which can be extended arbitrarily to realize building block assembly. At present, the color screen of large screen is not LED.
(6) The light source produced by LED does not have environmental pollutants such as mercury and lead, which will not pollute the environment. Therefore, people call LED light source "green" light source is well-deserved.
As the Nobel Prize in physics puts it： incandescent lights illuminate the 20th century, and leds will illuminate the 21st century.