Energy Conservation and sustainable development is no longer a selective issue, but it is the only way of world’s future development. Led as the representative of the new light source lighting to replace the traditional light source, it is causing a great change in lighting industry. Driven by innovative technology, the new lighting products are constantly being updated, from incandescent lamps to energy-saving lamps, halogen lamps to LED lamps. The lighting products have achieved energy-saving upgrades, and at the same time, they have also been improved in comfort, the lighting effect is also more diverse. As the representative of the Green energy-saving light source, LED lighting has become the most potential market in the industry. Compared with the more mature light source, what are the leading advantages of LED? The following is a brief introduction by the author.
12 unique advantages of LED lighting
In 1923, the scientist O.W. Lossew discovered that the P-N junction of silicon carbide had unidirectional conductivity and luminescence; around 1955, R. J. Haynes presented a study on P-N junction of semiconductor germanium, G. A. Wolff studied the luminescence of Gallium Phosphide; in 1968, the first red LED was produced by Monsanto and HP in the United States, making it an electronic product.
(1) energy conservation: the spectrum of leds is almost entirely concentrated in the visible light band, with a luminous efficiency of 80 to 90 per cent. The results show that the
luminous efficiency of the ordinary incandescent lamp is 12 lm/w, the life is less than 2000 hours, and the luminous efficiency of the spiral fluorescent lamp is 60 LM/W, with a life span of less than 8,000 hours, the T5 fluorescent lamp has a 96 ALMW life span of about 10,000 hours, while the 5 mm diameter white LED has a life span of 20 something 28 LLMW and can last more than 100000 hours. Some also predict an infinite upper limit on the lifetime of future leds.
The conventional wisdom is that cfls can save up to four fifths of energy, but leds can save up to a quarter more than cfls, a far greater innovation for Solid State Lighting. In addition, LED also has other advantages, high-quality light, basically no radiation, is a typical green lighting source, reliable and durable, very low maintenance costs, and so on. Because LED has the above other solid light source is unable to match the characteristics, 10 years later LED lighting industry will be the mainstream light source.
(2) safety and Environmental Protection: LED working voltage is low, mostly 1.4 something 3v; ordinary LED working current is only 10mA, ultra-high brightness is only 1a. Led in the production process do not add “Mercury” , do not need to inflate, do not need glass shell, impact resistance is good, earthquake resistance is good, not broken, easy to transport, very environmental protection, known as “Green Energy” .
(3) Long Life: LED small size, light weight, shell for epoxy packaging, not only to protect the internal chip, but also has the ability to light transmission and spotlight. Leds typically have a lifespan of between 50,000 and 100,000 hours, and because leds are semiconductor device, even frequent switches don’t affect their lifespan. At present, incandescent lamps, fluorescent lamps and energy-saving fluorescent lamps are mainly used for household lighting.
(4) Fast Response: the response frequency τmc of leds is related to the lifetime τmc of a few carriers injected. For example, for leds made of GaAs material, the response frequency of τmc is about 16 something 160 mhz in the range of 1 something 10 ns, this high response rate is sufficient for displaying a 6.5 mhz video signal, which is one of the key factors in achieving a video LED large screen.
At present, the lowest LED response time has reached 1 microsecond, the general for a few milliseconds, about the common light source response time 1/100. Therefore, it can be used in many high-frequency environments, such as car brake lights or state lights, can shorten the braking time of the vehicle behind the car, thus improving safety.
LED light source powerful advantage
(5) High luminous efficiency: incandescent lamps and halogen lamps have a luminous efficiency of 12-24 LM/W (Lumen/w) , fluorescent lamps have a luminous efficiency of 50 Something 70 lm/w, sodium lamps have a luminous efficiency of 90 Something 140 LM/w, and most electricity consumption becomes heat loss. The light efficiency of LED can reach 50 Something 200 LM/W after improvement, and the light has good monochromatic, narrow spectrum, no filtering can be directly issued colored visible light.
(6) small size of LED components: more convenient for the layout and design of various equipment, and can better realize the effect of “see the light but not the light source” in night scene lighting.
(7) high concentration of LED light energy: concentrated in the smaller wavelength window, high purity.
(8) LED light directivity is strong: brightness attenuation is much lower than traditional light source.
(9) LED can be driven by low-voltage DC power: with the advantages of small load, weak interference, the use of lower environmental requirements.
(10) better control of the composition of the Luminescence Spectrum: This makes it suitable for local or focal lighting in museums and exhibition halls.
(11) the size of the semiconductor luminescent layer and the List of semiconductor materials forbidden band can be controlled: thereby emitting light of various colors and having a higher degree of color.
(12) high color rendering: will not cause harm to the human eye.
In conclusion: as an emerging technology sector, the light-emitting diode industry is still in a fast developing stage, and we are pleased with the progress of Science and Technology, but we also have to realize that both the technology sector and the regulation of the industry, compared with the traditional light source, they are not mature and sound. There is still a long way to go before the LED can truly replace the traditional light source. We believe that by promoting the healthy and orderly development of the entire industry, continuously accelerating the pace of application and gradually transforming the traditional industry, and promoting the adjustment of the industrial structure, it will open energy-saving green quality of life for people.