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Everything about led street light you need to know

What is the led street light?

LED street lights refer to street lights made of LED light sources, which have unique advantages such as high efficiency, safety, energy saving, environmental protection, long life, fast response speed, and high color rendering index, and are of great significance to urban lighting energy saving.

Benefits and features of led street light

  1. The characteristics of itself – the unidirectionality of light, without the diffusion of light, to ensure the lighting efficiency.
  2. The LED street lamp has a unique secondary optical design, which irradiates the light of the LED street lamp to the area that needs to be illuminated, further improving the lighting efficiency, so as to achieve the purpose of energy saving.
  3. LED has reached 110-130lm/W, and there is still a lot of room for development, with a theoretical value of 360lm/W. The luminous efficiency of high-pressure sodium lamps increases with the increase of power. Therefore, the overall luminous efficiency of LED streetlights is stronger than that of high-pressure sodium lamps; ).
  4. The light color rendering of LED street lamps is much higher than that of high-pressure sodium lamps. The color rendering index of high-pressure sodium lamps is only about 23, while the color rendering index of LED street lamps reaches more than 75. From the perspective of visual psychology, to achieve the same brightness, the average illuminance of LED street lamps can be It is more than 20% lower than that of high-pressure sodium lamps.
  5. The light decay is small, the light decay is less than 3% in one year, and it still meets the road requirements after 10 years of use, while the high-pressure sodium light decays greatly, and it has dropped by more than 30% in about one year. Therefore, the design of LED street lights in the use of power Can be lower than high-pressure sodium lamps.
  6. LED street lamps have automatic control energy-saving devices, which can achieve the greatest possible reduction in power and save energy when meeting the lighting requirements of different periods. It can realize humanized functions such as computer dimming, time-segment control, light control, temperature control, and automatic inspection.
  7. Long service life: it can be used for more than 50,000 hours and provides three-year quality assurance. The disadvantage is that the life of the power supply cannot be guaranteed.
  8. High luminous efficiency: using chips of ≥100LM, compared with traditional high-pressure sodium lamps, it can save energy by more than 75%.
  9. Easy installation: No need to add buried cables, no rectifiers, etc., directly install on the lamp pole or nest the light source into the original lamp housing.
  10. Excellent heat dissipation control: the temperature is controlled below 45 degrees in summer, and passive heat dissipation is adopted, so the heat dissipation guarantee in summer is insufficient.
  11. Reliable quality: The circuit power supply is all made of high-quality components, and each LED has its own over-current protection, so there is no need to worry about damage.
  12. Uniform light color: no lens is added, and uniform light color is not sacrificed to increase brightness, so as to ensure uniform light color without an aperture.
  13. LED does not contain the harmful metal mercury, and will not cause harm to the environment when it is scrapped.
  14. Combining the above principles, the energy-saving effect is remarkable, and the replacement of high-pressure sodium lamps can save more than 60% of electricity.
  15. Low maintenance cost: Compared with traditional street lights, the maintenance cost of LED street lights is extremely low. After comparison, all investment costs can be recovered in less than 6 years.

The disadvantage of led street light

1. The power of a single LED is low. In order to obtain high power, multiple parallel connections are required.
2. Low color rendering. The color displayed under LED illumination is not as true as that of incandescent lamps. This is a technical issue that must be analyzed from the perspective of spectral distribution.
3. Spot. The “yellow circle” problem is easily caused due to defects in the manufacturing process of the white light LED itself and the matching error with the reflective cup or lens.
4. LED illumination uniformity problem. If the secondary optical design is not carried out, the illumination of the LED is relatively concentrated, so the secondary optical design must be carried out so that the light intensity distribution diagram is bat-shaped.
5. LED light decay problem. Compared with low-power LEDs, the light decay of high-power LED streetlights will be much better. But low-power LED heat dissipation is very small. However, high-power LEDs have problems that cannot be solved by heat dissipation, and the brightness will decrease significantly after heating, so the power cannot be increased. The largest wattage LED street light sold in the market is a 400W led street light.

LED streetlight types

Different types of LED street lights will be selected in the market according to different application places or use environments. Common LED streetlights are as follows

Low voltage LED street light: 12V DC, 24VDC, 48VDC input voltage. The 12V led street light is mostly used for the solar system.

Cobra head street light:  This is made of COB-led chips as a light source, it is easy to assemble and replace.

Dusk to dawn street lights: This kind of street light has a photocell, which can automatically turn on the light at dusk and turn off the light at dawn, which can save management costs.
Dimmable led street light: Dimmable street lights include three schemes of thyristor dimming, 0-10V dimming, and DALI dimming
Decorative led street light: This kind of street light is mainly led pole lights, and garden pole lights, mainly used in residential areas or sidewalks.

Adjustable tool-free led street light: This street light with tool-free design with clips, which is easiest to do maintenance without any tool, and generally, it is also with a 90° adjustable joint, which not only works with a pole with a single arm but also works for a pole.

adjustable led street lights

Wattages and price

LED street lights mainly include 30W to 400W. The actual power can be adjusted according to the different requirements of customers. From the current LED technology, the light efficiency is generally 110-160lm/W. Different types of street lights with different powers will have different prices. Now we take the conventional module street light, 120lm/W input as the standard, and list their relative prices

Wattages 30W 50W 80W 100W 120W 150W 180W 200W 250W 300W 400W
Lumens 3600lm 6000lm 9600lm 12000lm 15000lm 18000lm 21000lm 24000lm 30000lm 36000lm 48000lm
Installation pole height 3-4m 4-5m 5-6m 6-7m 7-8m 8-10m 9-10m 10m-12m 12m 13m 14-16m
Cost USD9.6 USD13.6 USD21.8 USD23.2 USD32.8 USD 36.85 USD45.77 USD49.8 USD59.76 USD69.66 USD89.96

You can inquire us if you need to know other types.

Why led street lights instead of old metal halide street or HPS light fixtures?

The economic and environmental benefits of LED street lamps are several times that of traditional ones. Below we can use the two powers commonly used in the market for comparison

Name
250W HPS street light
120W LED Street light
400W HPS street lamp
200W LED street light
Street light type
HPS-250W
GR-SL-120W
HPS-400W
GR-SL-200W
Light power(W)
250W
120W
400W
200W
Driver power(W)
80W
20W
130W
20W
Actual power(W)
330W
140W
530W
220W
Daily power consumption (kWh/day)
3.96
1.26
6.36
1.85
Year power consumption (kWh/Year)
1445.4
459.9
2321.4
897.9
Electricity fee (USD/year)
204.4USD
65USD
328.46USD
127USD
Maintenance fee (USD/year)
30.76USD
0
30.76USD
0
Bulb light(USD/Year)
15 USD
0
30USD
0
Total cost(USD/Year)
250.6USD
65USD
390USD
127USD

Some points you need to know when choosing led streetlights

Luminous efficiency

The technology is becoming more and more mature, and the high-power LED light source can meet the needs of general street lamps. The luminous efficiency of general high-pressure sodium lamps is 100LM/W, and the commonly used high-power LEDs are 120-160LM/W. Foreign LED chips can reach 180LM/W. The higher the luminous efficiency, the better the energy-saving effect, which is also a choice. One of the most important indicators of LED street lights. However, there are no clear regulations on this in the LED standard, so it must be carefully confirmed when purchasing LED street lights.

Light decay

And some merchants, in order to reduce costs, use hundreds of 0.5W low-power LEDs. However, the light decay of this low-power LED is very serious, and the life of the light decay to 80% is only 1000 hours. Therefore, as a street lamp that needs to be used for a long time, it is absolutely not allowed to use this kind of low-power LED. If you choose a high-power LED (generally above 30W), the light decay will be much better.

Cooling

Because LED is a semiconductor component when its chip is affected by temperature and is reduced to 30% of the initial luminous flux, it will lose its lighting meaning, that is, its life is over. In theory, the life of high power LED street lights is 30,000-50,000 hours, but The important prerequisite is good heat dissipation. It is worth mentioning that domestic manufacturers have adopted the world’s leading needle-cooling technology.

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