Shanghai Ceyuan Industrial Co.,Ltd

Shanghai Ceyuan Industrial Co.,Ltd

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Shanghai Ceyuan Industrial (SCI) Ltd.

ADD:Room 901, No.20, Lane777, West Guangfu Road, Putuo District, Shanghai, China. 

Contact: Ellie Wang

TEL: +86-573-82753308

Mobile: +8618042017693

FAX: +86-573-82753302



LED Street Light Develop

LED street lamp is made of street lamp, LED lamps and lanterns with high efficiency, safety, energy saving, environmental protection, long service life, fast response speed, high color rendering index of unique advantages, the city lighting energy saving is of great significance.

LED street lamp with conventional street lamps, the LED light source adopts low voltage dc power supply, by GaN power type synthetic efficiency white light, blue light leds and yellow is efficient, safe, energy-saving, environmental protection, long service life, fast response speed, high color rendering index of unique advantages, can be widely used in road. The outer cover can be made, the heat resistance is 135 degrees, and the temperature is low to 45 degrees.


1. The characteristic of itself -- the unidirectional light of light, without the diffuse of light, guaranteed illumination efficiency.

2. The LED street lamp has unique secondary optical design, which will illuminate the light of LED street lamp to the area where it needs to be illuminated, and further improve the lighting efficiency to achieve the energy-saving purpose.

3. The LED has 110-130lm/W, and there is a lot of room for development. The theoretical value is 360lm/W. The luminescence efficiency of the high pressure sodium lamp increases with the increase of power, therefore, the overall light-effect LED street lamp is stronger than the high pressure sodium lamp. (this overall light effect is theoretical, in fact, the light effect of the high-pressure sodium lamp above 250W is higher than that of LED lamps).

4, LED street lamp light color is higher than high pressure sodium lamp, high-pressure sodium lamp only around 23, color rendering index and the LED street light color rendering index above 75, think in terms of visual psychology, to achieve the same brightness, LED street light can an average of more than 20% lower than the high-pressure sodium lamp,.

5, light failure is small, light failure is less than 3% a year, still meet the requirements of the road to 10 years, and high pressure sodium light failure is big, has fallen by more than 30% a year or so, therefore, the LED street light on the design of the use of power can be lower than the high-pressure sodium lamp.

6. The LED street lamp has automatic control of energy saving device, which can achieve the maximum possible reduction of power and save energy by meeting the lighting requirements of different time periods. It can realize computer dimming, time period control, light control, temperature control, automatic inspection and other human functions.

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

8. High efficiency: using a chip with more than 100 lm or more, it can save more than 75% energy compared to the traditional high pressure sodium lamp.

9. Installation is simple: no need to add buried cable, no rectifier and so on, directly installed on the lamp post or the light source in the original lamp shell.

10. Excellent cooling control: the temperature of the summer is controlled below 45 degrees, and passive heat dissipation is adopted.

11. Reliable quality: all circuit power supply adopts high quality components, each LED has individual flow protection, no need to worry about damage.

12. Uniform light color: without lens, it is not used to improve brightness and uniform light color, thus ensuring that no aperture is even.

13. LED does not contain harmful metal mercury, and does not cause harm to the environment when scrapped.

The energy saving effect of the above principle is remarkable, and it can save more than 60% by replacing the high pressure sodium lamp.

Maintenance cost is low: compared with traditional street lamps, LED street lamp maintenance costs are very low. After comparison, the whole input cost can be recouped in less than 6 years.


1. Low single LED power. In order to achieve high power, multiple parallel applications are required.

2. Low color rendering. The color shown in the LED irradiation does not have the actual incandescent lamp, which should be analyzed from the spectral distribution and belongs to the technical problem.

3. Light spots. It is easy to create "yellow circle" problem because of the defects in the manufacturing process of white LED LED and the matching error of reflecting cup or lens.

4. The uniformity of LED exposure. If the secondary optical design is not carried out, the irradiation of the LED is relatively concentrated, so a secondary optical design must be carried out to make the light intensity distribution of the light in bat shape.

5. Light failure of LED. Compared with small power leds, high-power LED street lamps have a much better light failure. But small power leds emit very little heat. The high power LED is a problem that there is no solution to heat dissipation, and the brightness will decrease obviously after heating, so the power can not be large. The biggest Spark LED by the market is 360W.

The development of LED street lamps should be noted in the following aspects:

A. The improvement of optical communication also requires further improvement from the high power LED's epitaxial technology and chip technology. The way to make white leds at home and abroad is to place the LED chip on a sealed substrate, bond with the gold wire, then apply YAG phosphor powder around the chip and seal it with epoxy resin. Resin ACTS as a protective chip and a condenser. The blue light emitted from the LED chip is reflected, absorbed, and finally outward from the surrounding fluorescent powder. The peak of the LED (blue) spectral line is at 465nm and the half value is 30nm. LED part of the blue light stimulates the yellow YAG phosphor layer, the yellow light (peak at 555 nm), part of the blue light directly or sent out after reflection, eventually reach outside the light blue Huang Er colored light, white light. The chip flip chip can be more effective than traditional LED chip packaging technology. But if you don't add a reflector to the surface of the glowing layer of the chip to reflect waste light energy, it will cause about 8 percent of the light loss. So the substrate material must be added to the reflector. The light on the side of the chip must also be reflected by the heat sink mirror to increase the luminous rate of the device. In addition, a layer of silicone material should be added to the surface of Sapphire and epoxy resin to improve the refractive index of the chip. The improvement of optical encapsulation technology can greatly improve the luminous flux of high-power LED devices.

B.LED lighting appliance is optimized to improve the quality of LED. Therefore, it is particularly urgent to study the secondary optical distribution design of high-power LED light source to meet the needs of large-area casting and flood lighting. Through the secondary optical design technology, the design of the external reflecting cup and multiple optical lens and aspheric surface can improve the optical efficiency of the device. Traditional illuminant direction of 360 °, lamps and lanterns is relying on the reflector will be most of the light reflection to a specific location, only about 40% of the light is directly through the glass to the road, the other is through the reflector lamps and lanterns to cast out the lamps and lanterns, the reflectors of lamps and lanterns of efficiency is only 50% ~ 60% commonly, so there are about 60% within the lamps and lanterns, light output is 30% ~ 40% in lost and then projected onto the pavement. A large portion of the light source of the light source is limited to the heat consumed within the luminaire. Before most of the LED light is a shoot the light, can achieve > 95% of lights, this is LED one of the important features different from other source, if this feature can not be good use, can make the advantage of leds. More than most of the high power LED lights because it is the LED chip assembly, will be so much light source according to the different direction, we give full play to the whole chip encapsulation, the characteristics of settled with lens through the optical design, according to different needs, equipped with different convex curve, rely on the lens to the light distribution in different directions, of the light Angle can reach 120 ° ~ 160 °, small light can be gathered within 30 °, once the lens shape, in guarantee under the premise of production technology, the same light distribution characteristics of lamps and lanterns also reached consensus. It is possible to continuously summarize experience through trial and trial, which can enable LED street lighting to meet the requirements of road lighting standards. Tunnel lamps, street lamps and general lighting have reached the lighting requirements of their respective applications.

C. Heat dissipation is the problem that LED street lamps need to focus on. As is known to all, leds are photoelectric devices. Only 15 to 25 percent of the electricity in the process is converted to light energy, and the rest of the electricity is converted to heat energy, which raises the temperature of the LED. Heat dissipation is a big problem in high-power leds. A 10 w white LED, for example, if the photoelectric conversion efficiency is 20%, there were 8 w electrical energy into heat energy, if not add cooling measures, the high power LED is the core of the temperature will rise sharply, when its junction temperature (TJ) rise more than the maximum permissible temperature (typically 150 ℃), high power leds will be damaged due to overheating. Therefore, in the design of high-power LED lamps, the most important design is the design of heat dissipation. Because LED street lamp brightness requirement is high, use environment is more rigorous, if the heat dissipation solution is not good, can quickly lead to the LED ageing, the stability is reduced. A lamp with 250W high pressure sodium lamp, which is well controlled due to its mature technology, is still very small even if it works 5000 hours. Under the same conditions, high-power LED street lamps, if the heat dissipation is not good, the light will be large. The main heat dissipation modes of LED street lamps include: natural convection heat dissipation, fan forced heat dissipation, heat pipe, loop heat tube cooling, and all temperature plates cooling, etc. The heating system is complicated and reliable, and the heat pipe and the temperature are high.

D.LED street lamp will eventually choose modular installation and maintenance. At present, the most high pressure sodium lamp used for road surface is not easily damaged by the inner ballast and other parts, most of which are not bright because of the damage of the light source, the way to repair is to replace the light source. A skilled operator can operate on a high level. However, LED street lamps, there are many parts inside, besides the light source (chip), other parts of the damage will lead to the chip not bright. Therefore, at the scene, it is not possible to immediately determine the cause of LED street lamp damage. If LED street lamps are not bright, the LED street lamps will need to be removed and returned to the factory for inspection. This way of replacing LED street lamps is cumbersome. The final version of LED street lighting is the development of modularity. The light source, electric and so on are all replaced according to the plug, so that a skilled worker can independently determine the cause of the damage and conduct on-site maintenance

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