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LED street lights introduced
- May 12, 2017 -

LED lights and conventional high-pressure sodium lamp street lamp is different, high-power LED street light source using low-voltage DC power supply, by the GaN-based power LED and yellow phosphor synthesis of high efficiency white light diode, with high efficiency, safety, energy saving, environmental protection, life Long, fast response, high color rendering index and other unique advantages, can be widely used in urban road lighting. Cover can be made of PC tube, high temperature 135 degrees. Low temperature -45 degrees

 

Light-emitting diodes (Light EmittingDiode, abbreviated as LED) is based on the formation of semiconductor PN junction with a weak power can light the efficient solid-state light source, in a certain forward bias voltage and injection current, into the P area of holes and injection of N Area of electrons in the diffusion to the active area after the radiation recombination and issued photons, the electrical energy directly into light energy.

LED road lights .png

History development

As the world's most eye-catching new generation of light source, LED because of its high brightness, low heat, short life, non-toxic, recyclable and other advantages, known as the 21st century is the most promising green lighting.

 

From 1962 the first red light-emitting diode was born, people continue to develop orange, yellow, green and other monochrome LED, and for a variety of signal instructions, logo, digital display, and gradually develop to small LED display The It uses solid semiconductor chip as a luminescent material, when the release of excess energy, causing photon emission, resulting in the application of semiconductor PN junction light source made of LED, came out in the early 1960s, 1964 red light-emitting diode first developed successfully, yellow LED appears.

 

The world's first commercial light-emitting diode (LED) was made in 1965 with germanium material, the unit price of 45 dollars. Shortly thereafter, Monsanto and Hewlett-Packard introduced the commercially available LED with GaAsP. Which is much lower than the general 15 ~ 100W incandescent 151m 1991 industry using MOCVD epitaxial growth of four yuan system materials, the development of high-brightness light-emitting diodes; 1994 in the GaN substrate developed the first blue light-emitting diodes; Year through the blue light to stimulate the phosphor, to make the first white LED; 2001 with UV excitation phosphor made of white LED.

First, the global industrial structure presents a monopoly situation, mainly concentrated in Japan and Taiwan.

 

Semiconductor lighting industry has been formed to Asia, the United States, Europe, the three regions dominated by the three pillars of the industrial distribution and competitive landscape. The global LED industry is mainly distributed in Japan and Taiwan. Among them, Japan accounts for nearly 50% of the global LED output value. The output value of Taiwan (including Taiwan and mainland China) is 21% of the global LED output value.

 

Second, the international manufacturers to lead the development of the industry, the use of technical advantages occupy high value-added products.

 

Japan and the United States two regions of the enterprise to use its new products and new technologies in the field of innovative advantages, mainly engaged in the production of the highest value-added products. Which Japan almost monopolized the global high-end blue, green LED market, the world's second largest packaging output, the largest output value of the production area.

Third, industrial investment continues to increase, the international well-known manufacturers to accelerate the pace of cooperation to occupy a favorable market position.

 

Fourth, China has become an important packaging base, domestic and foreign enterprises have to seize the huge domestic market investment.

Application place

LED street lamp main application, trunk road, secondary road, slip road, factory, school, garden, city square, garden and other road lighting.

 

Output power and luminous flux also need to improve from the high-power white LED epitaxial technology, chip technology and other basic level to further enhance. In the secondary optical design, LED radiation forms are Lambertian, side shot type, bat airfoil and condenser type several. In the field of road lighting, according to the design experience Lambertian and bat airfoil more applicable, through the secondary optical design, making the LED light range, photometric curve in line with the needs of road lighting.

The most common form of LED use in road fixtures is mainly in the fixture, in a nearly flat mounting surface (also reflective surface), fitted with a matrix of LED, this design is impossible to get a good lamp Light distribution.

 

Performance characteristics

LED lights and conventional street lamps is different, LED light source with low voltage DC power supply, by the GaN-based power-type blue LED and yellow synthesis of high efficiency white, with high efficiency, safety, energy saving, environmental protection, long life, fast response, high color rendering index Unique advantages can be widely used in roads. Cover available production, high temperature of 135 degrees, low temperature -45 degrees.

Advantage:

1, its own characteristics - the one-way light, no light diffusion, to ensure the efficiency of light.

 

2, LED lights have a unique secondary optical design, the LED lights light to the desired lighting area, to further improve the efficiency of light to achieve energy-saving purposes.

 

3, LED has reached 110-130lm / W, but also a lot of room for development, the theoretical value of 360lm / W. And the luminous efficiency of high-pressure sodium lamp is increased with the power increased, therefore, the overall light effect LED street lamp than the high pressure sodium lamp; (the overall light effect is theoretically, in fact more than 250W high pressure sodium lamp light efficiency than LED lights ).

 

4, LED lights light color than the high pressure sodium lamp much higher, high pressure sodium lamp color rendering index is only 23 or so, and LED street light color rendering index of 75 or more, from the visual psychological point of view, to achieve the same brightness, LED lights, the average light Than the high pressure sodium lamp by more than 20%.

 

5, light fades small, less than 3% of the light of one year, the use of 10 years still meet the road requirements, and high pressure sodium lamp decline, about a year has fallen more than 30%, therefore, LED lights in the use of power design Can be lower than the high pressure sodium lamp.

6, LED lights have automatic control of energy-saving devices, to meet the lighting requirements in different circumstances to meet the maximum possible reduction in power, saving energy. Can achieve computer dimming, sub-time control, light control, temperature control, automatic inspection and other user-friendly features.

 

7, long life: can use more than 50,000 hours, providing three years of quality assurance. The downside is that the life of the power supply is not guaranteed.

 

8, high luminous efficiency: 100LM above the chip, compared to the traditional high pressure sodium lamp can save more than 75%.

 

9, easy to install: no need to add the cable without rectifier, etc., will be installed directly on the pole or the original light source nested lamp shell.

 

10, excellent heat control: summer temperature control below 45 degrees, and the use of passive cooling, summer heat protection.

 

11, reliable quality: all the use of high-quality circuit components, each LED has a separate over-current protection, no need to worry about damage.

 

12, light color uniformity: no lens, not to improve the brightness at the expense of uniform light color, so as to ensure that no aperture light color uniform.

 

13, LED does not contain harmful metal mercury, in the retirement will not cause harm to the environment.

 

Combined with the above principles of energy-saving effect is remarkable, instead of high-pressure sodium lamp can save more than 60%.

 

Low maintenance costs: Compared to traditional street lamps, LED lights maintenance costs are very low, after comparison, less than 6 years to recover all the input costs.

Disadvantage:

1, a single LED power is low. In order to obtain high power, multiple parallel use is required.

 

2, low color rendering. In the LED display under the color of the incandescent lamp is not true, which from the spectral distribution of the analysis, are technical issues.

 

3, spot. As the white LED manufacturing process defects with the reflective cup or lens with the error, likely to cause "yellow circle" problem.

 

4, LED irradiation uniformity problem. If you do not carry out the second optical design, LED irradiation is more concentrated, so be sure to carry out the second optical design, so that the light intensity distribution was bat-shaped.

 

5, LED light failure problem. Compared to low-power LED, high-power LED lights will be much better light failure. But the small power LED heat dissipation is very small. And high-power LED is there is no way to solve the problem of heat, and heat will be significantly reduced after the brightness, so the power can not be bigger. Now the market sales of Spark LED lights is the largest 360W.


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