LED Street Light Components/Parts

LED street light accessories include LED chips, PCB boards, lenses, power supplies, housings, lightning protection devices (optional), and control components (optional). The picture above is the led street light circuit diagram.

led pcb

LED Chips & PCB Board

LED chips mainly include COB and SMD. The most commonly used street lamp models in street lamps are SMD3030, and SMD5050. The main brands of LED chips are Philips, Bridgelux, Samsung, CREE, Sanan (second line), and more.

Since the input voltage (3V/6V) and current of a single LED chip are very small, it needs to be soldered to the PCB board. It is needed for the series and parallel connection to be connected to the power supply. The PCB board can also play the role of cooling the LED. The material of street lamp PCB is generally aluminum.

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Power Supply

LED chips need a power supply to convert high-voltage alternating current into low-voltage direct current to work safely. The grid voltage is usually unstable, so the power supply needs to have better performance to protect the LED chips.

Power supply types: isolated power supply, non-isolated power supply, constant voltage power supply, constant current power supply, wide-amplitude voltage power supply, narrow-amplitude voltage power supply

Power supply brands: Philips, Mingwei, Sosen, Inventronics, Osram, UE, etc. Power supplies that require a warranty of 5 years and more than 5 years use these brands of power supplies.

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ST22A BACK

LED Street Light Shield – Aluminium House

The LED street light shell effectively protects the LED chip, power supply, wires, and other components from erosion caused by an external force. The exterior design of the street light housing can also decorate the surrounding environment.

Since about 2008, hundreds of street lamp housings have appeared on the market. In the beginning, the LED chip has low light efficiency and generates a large amount of heat per wattage. Therefore, the street lamp housing needs a large heat dissipation area and should be large and heavy in weight. 

With the continuous improvement of LED light efficiency, the heat emitted by a single wattage gradually decreases. Correspondingly, the housing of the street lamp becomes smaller in size and lighter in weight.

In the first few years, aluminum heat sinks and LED modules were added to the traditional iron street light housing. The method of adding a glass cover to the reflector has low light efficiency and high cost. After that, all street lamp housings were redesigned according to LED characteristics. Die-casting aluminum one-piece molding, has a beautiful appearance, firmness, and low cost. The LED is directly covered with a lens, and the light efficiency is high.

Click to see more led street lights reviews.

LED LENS

LED Lens

LED streetlights are composed of various LED lenses. Each has its distinct features and beam angle. Below are the types you can choose from

Road Type

Depending on the road, lenses with different light divisions can be used. In this way, the uniformity of road lighting can be maximized. The uniformity of road lighting should be above 0.4. Below are pictures of several common road types.

Light Distribution Curve

The lateral light-emitting angle of the street light road lens is between 130° and 150°. The longitudinal beam angle is between 60° and 70°. In the light distribution diagram, the light distribution curve of the street light is very similar to the wings of a bat. Below are pictures of several street light distribution curves.

Lens Material

The materials of the street lamp lens are tempered glass and acrylic. Because of the two material characteristics, most street lights use PMMA lenses.

Advantages of tempered glass: high hardness, high light transmittance (above 95%), high-temperature resistance, and no discoloration. 

Disadvantages of tempered glass: large volume, heavy weight, single shape, fragile, difficult to achieve mass production, low production efficiency, and high cost.

The advantages of acrylic lens: The light transmittance is above 92%, easy to produce, low cost, and easy to distribute light. 

Disadvantages of acrylic: It is not resistant to high temperatures (above 100 degrees Celsius), and it is easy to turn yellow after a long time.

Main Parameters in LED Street Light Specifications / Technical Datasheet

Here we list the main parameters that need to be paid attention to when buying LED street lanterns.

Wattage Power (W)

Wattage power (W) is the power consumption of LED lamps. The LED power accounts for about 90%, and the power supply accounts for about 10%. LED street light power is usually 30W, 50W, 60W, 100W, 150W, 200W, 250W and 300W.

Light Effect ( LM/W)

The luminous flux (lumens) produced by an LED light fixture per watt of electricity consumed. The light efficiency of led lamps is usually between 100lm/w and 170lm/w. The light efficiency of lamps is mainly determined by the light efficiency of LED chips. LED chip light efficiency is also related to color temperature and color rendering index. In addition, the light efficiency of the lamp is also related to the transmittance of the lens and the energy conversion rate of the power supply.

IP Rating 

IP Rating is about led light outdoor waterproof. The IP rating of streetlights is usually IP65. But some suppliers falsely mark the IP lamps of LED street lights as IP66. IP66 means that the luminaire can work underwater. However, be careful with this false label as it is impossible to achieve IP66 in the structural design of LED street lamps. Moreover, it is also not necessary to achieve that IP66 rating.

Color Temperature

Color temperature refers to the color of light emitted by a fixture. The color temperature is generally between 3000K and 6500K. 3000K is yellowish, and 6500K is blueish. To avoid white light pollution, many cities now use street lights with a color temperature of 3000K.

LED Chip Model & Brand

The main brands of LED chips: are Osram, Philips, Cree, Samsung, Sanan, and so on.

The main model of the street lamp LED chip is 3030, and the light efficiency of the 3030 chip is between 130 and 190lm/w. The 5050 chip is also used by the project, and the light efficiency of the 5050 chip can reach 180 to 230lm/w.

Color Rendering Index

The color rendering index refers to the ability of light to reveal the original color of an object. The display index of solar energy is 100 whereas its color rendering index is 70 to 90. On the other side, traditional high-pressure sodium lamps’ color rendering index is around 20 to 30.

Beam Angle

The lateral light-emitting angle of the LED street light is between 130-150°. The longitudinal lighting angle of LED street lights is between 60-70°. Moreover, the light distribution curve of LED road lights is basically in the shape of bat wings. The shape of bat wings’ light distribution curve can make the road lighting brightness more uniform.

Power Driver Brand

The main power supply brands for street lamps are Osram, Philips, Meanwell, Sosen, Inventronic, UE, and so on.

Size & Weight

The size and weight of the street light are related to the IK level. The general street light IK level can reach IK08.

Installation Angle Adjustment

According to the road conditions, the installation angle of the street light needs to be adjusted horizontally or vertically in the range of 0-15°.

Lightning Protection Level

The lightning protection level of the street lamp power supply is between 2-5kv. A lightning protection device can also be installed, and the lightning protection level is 10KV, 15KV, and 20KV.

Dark-to-Dawn Dim

The dark-to-dawn dim function automatically turned on the street lights when it is dark and automatically turned off during the day.

Auto Time Dim

If the LED street light has the auto time dim period, you can set the power of the street light. If you want you can set them to be different in 3 to 5 time periods at night. For example, there are many pedestrians in the first 4 hours, so the brightness is set to 100%. In the middle of the night, when there are few pedestrians, set the brightness to 50% to save power.

Remote Intelligent Control of Street Lamps

The intelligent street lights adopt ZIGBEE, 0-10V, and GPRS communication dimming technology to realize real-time monitoring, and recording. You can also adjust each street lamp on the computer or mobile phone. Click to see more remote control technologies for smart street lights.

LED STREET LIGHT luminaire Certification, Testing standards

The following are the main certifications and tests for LED street lights in various national markets

Europe: CE/GS/TUV/CE-NB

Australia: SAA/Australia EMC/LCP/VEET/IPART

North America: UL/ETL/CSA/FCC/IC

Brazil: Inmetro

OPEC, Africa: SABER

IES testing: Test the beam angle, light distribution curve, light effect, etc.

Integrating sphere: detect lamp color temperature, color rendering index, luminous flux, voltage, current, power factor, etc.

Heat dissipation test: test the surface temperature of the lamp after lighting it for some time.

Waterproof test: test the waterproof level of lamps, usually IP65

Salt spray test: test the corrosion resistance of lamps.

Light decay test: test the change of light efficiency with time decay after working for a period of time, usually LM79 LM80.

Wind test: test the ability of lamps to resist strong wind.

EMC: Test the ability of lamps and lanterns to resist electromagnetic interference

LVD: Test the low voltage safety performance of lamps

How to Install an Led Street Light?

Click here to see how to install street light poles and trench street light wires.

Before Installing Street Lights

  1. Construction personnel must have relevant certifications, knowledge, and work experience.
  2. When handling the street light, be careful with the street light glass and lens.
  3. Any installation should be done with the power completely off.
  4. Installation operations must be carried out properly, including the use of relevant tools and equipment.
  5. During construction, it must be confirmed whether the weather is within the scope of outdoor high-altitude electrical work.
  6. Street light installations must be equipped with work trucks with lift tables, warning signs, flashing lights, etc.
  7. Do not put the street light in an environment of humidity, rain, vibration, corrosion, and a strong electromagnetic field.

Preparations Before Installing Street Lights

  1. Check whether the fasteners of each part of the lamp are firm and can work normally.
  2. Prepare installation tools: wrench, screwdriver, wire stripper, multimeter, wire, tape measure, etc.

Street Lamps Installation Steps

  1. Correctly connect the street light power cord and the light pole cable.
  2. Connect the street lamp head to the polearm.
  3. Adjust the direction of the street light so that the street light illuminates the effective area of the road.
  4. Add washers, and spring sheets, and fasten with nuts.
  5. Check the wiring and test whether the street lights work properly.
  6. Smoking is strictly prohibited during the installation of street lights.
  7. When threading the wires, be careful not to get the wires caught at the pole connection.
  8. Do not bump or scratch the lamp body, wires, and lens during installation.

Street Lamp Assembly Steps & Quality Inspection 

The production process of street lamps includes many steps and parameters. 

  • LED welding
  • PCB board coating with thermal grease
  • Fixing PCB board
  • Welding PCB board wires
  • A preliminary power-on inspection of lamps
  • Fixing power supply
  • Installation of the lens and whole lamp screws
  • Aging 
  • Power-on impact test
  • Whole lamp inspection
  • Packaging and storage
 

During the material testing, check whether:

  • the casing has surface scratches during transportation 
  • the lens has surface scratches
  • the LED chips are soldered, leaked, desoldered, or damaged
  • the PCB input voltage and current are correct
  • the input and output parameters of the power supply are correct
  • the hole position and the screw match
 

In inspection during production, kindly check whether:

  • the thermal grease is applied evenly
  • you need to solder LED chips. Pay attention to anti-static measures.
  • the screws for fixing the PCB, lens, and housing are loose
  • the input voltage and current of the whole lamp meet the requirements
  • there is a sealing strip, or is the sealing strip stuck in the correct position

In the whole lamp aging test (after a long time of lighting), check whether the temperature, voltage, current, and luminous flux of the lamp meet the requirements.

LED Street Lights vs. Normal Street Lights

Comparisons: LED Street Lights vs. Traditional Street Lights

Generally, LED street lights are designed differently than traditional street lights. Although these two share the same function—to provide enough light and security, they have distinctive light sources, features, and designs. With that being said, these two also carry different advantages. So we explain the difference between LED Solar street lights and the standard type of street lights.

If you are just new to LED street lights, it is crucial to know first all of the necessary information. Below, we list the 11 tips for buying outdoor led streetlights.

High light efficiency to reduce electricity costs

As a third-generation light source, the light efficiency of LED chips can reach 230lm/w. On the other hand, the light efficiency of traditional high-pressure sodium light sources is only 100lm/w.

Also, the power factor of LED street light power supply can reach more than 95%, while the traditional high-pressure sodium lamp ballasts can reach 70% only.

The LED chip is directional light-emitting with low-loss secondary light distribution. Currently, the highest luminous efficiency of LED street lamps can bear about 170lm/w. The high-pressure sodium lamp light source emits 360°, and its effective light efficiency is 60-70lm/w.

Save energy and reduce carbon emissions

Based on the statistics data, traditional energy sources such as coal and oil account for more than 75% of the world’s used energy. We all know that the increase in carbon emissions also increases the global greenhouse effect. With the application of LED streetlights, you will not only save energy consumption but also reduces carbon emissions.

Environmental-friendly

LED chips are light-emitting semiconductors that do not produce any harmful substances during operation. Meanwhile, the high-pressure sodium lamp contains sodium and tribute harmful metals. Once leaked, it will cause serious environmental pollution.

Long life and reduced maintenance cost

Compared to the lifespan of LED chips, the traditional is always shorter. In fact, LED solar lights can last more than 50,000 hours. Most road light suppliers have also launched LED street light products with a 10-year warranty. On the other hand, the actual service life of high-pressure sodium lamps is only about 2 years. Not to mention that the labor cost of street light source replacement is expensive.

More uniform road lighting

The LED chip has a small light-emitting volume, which is convenient for the unique secondary optical design. These lenses have different light distribution curves. LED street light bulbs can make the uniformity of road lighting reach more than 0.4. However, traditional street lamps cannot provide secondary light distribution. The figure below is the actual lighting comparison of the two street lamps.

Lower-cost power supply system

Street light power supply lines require a special power supply system to distribute power. The power supply system, including the transformer, is expensive. But, lower-power LED street lights can reduce the power supply system cost.

High color rendering index

The color rendering index of high-pressure sodium lamps is only 20-30, while the color rendering index of LED can reach 70-90. The higher the color rendering index, the more the object’s original color can be displayed.

Smart Lighting

LED chips are semiconductors, and it has various smart lighting functions such as remote dimming, light control switches, etc. These functions can better save energy, manual operation, and maintenance costs. With these functions, solar LED street lights appear smarter and more convenient than traditional street lights.

Quick Start

LEDs can reach their maximum brightness in tens of nanoseconds and are not affected by low temperatures. On the contrary, incandescent or fluorescent lighting can take too long to warm up before even turning on under low-temperature conditions.

Safer & Secure

The popularity of LED lights has made city streets and public areas brighter and safer. Having a brighter place can effectively reduce the crime rate compared to dark places. Recent studies on crime rates in cities such as Los Angeles and New York also support this view.

Reduce white light pollution

According to the BBC, 99% of people in countries such as Europe, the United States, and Asia live in areas with white light pollution. When LED lights were first used, they were also found to be polluted by blue light. But the design of the later lamps hinders it from happening. The secondary light distribution and dimming of LED lights also effectively reduce the white light pollution of traditional lights.

LED Street Light Cost Savings Calculator

Let’s assume that a city has a road with a length of 10 kilometers. And the laying of street lights is calculated as one every 30 meters and one on each side. The total number of streetlights required for this section of the road is 668. The given traditional street light is based on a high-pressure sodium lamp with a power of 250W. Whereas, the LED street lamps are compared with a power of 80W.

Comparison of Lights Cost

Let’s say that the unit price of traditional street lamps is 150 US dollars per lamp while LED street lights are 500 US dollars per light. The cost of the light source required for laying traditional street lamps is 668*150 US dollars = 100,200 US dollars. So, the light source required for laying LED streetlights becomes 668*500 US dollars = 334,000 US dollars.

Comparison of Wire Cost

Let’s analyze the cost of laying cables for the two light sources. The cable flow of the traditional street lamp trunk line on a 10-kilometer road is I=P/U=666*250/220=680A. It requires a copper core cable with a cross-section of 400m2, and the unit price is 60 US dollars/meter. The cable cost is $60 * 10000 = $600,000

The load flow of the main cable of the LED street light is I=P/U= 666*50220=146A. It requires a cross-section of 42mm2 copper core cable, and the unit price is 10 US dollars/meter. So, the total cable cost is $100,000.

Comparison of 5 Years of Electrical Cost

Suppose the electricity bill is $0.50 per kilowatt hour.

Traditional street light: 250W x 10h x 365 x 668 x 10 = 3047750 kW.H. $1,523,000 for 5 years of electricity.

LED street light: 80 x 10h x 365 x 668 x 5 = 975280 kW.H. $487,000 for 5 years of electricity.

Comparison of 5-year Operation & Maintenance Cost

LED lights do not need to be replaced, and the maintenance cost is 0. On the other hand, traditional street lights need to change the light source 2 to 5 times. Additional light sources and labor costs are also required. If the cost of the traditional street light source is 15 dollars, the labor cost is also 15 dollars. Then the maintenance cost of traditional street lights for 5 years is 75 US dollars.

Cost comparison of LED street lights and traditional street lights for a 10-kilometer road in 5 years

LED Street Light Cost Savings Calculation

F.A.Q.

First of all, this is not a problem with LED streetlights. The color temperature of some street lights is between 6000-6500K. The higher the color temperature, the bluer. Another reason is that the input voltage of the white LED is too large, causing the LED light to turn blue.

The human eye can perceive flicker at frequencies below 70hz. Below are some of the common reasons for the LED street lights blinking problems:

  1. The main root can be a power supply problem. A street light power driver has generally a constant current power supply. The constant current power supply ensures the constant current of the LED terminal by continuously adjusting the input voltage. The input voltage of the constant current power supply has a range. Once the input voltage exceeds this range, the street light starts to flash.
  2. The LED chip and the drive power do not match. The input voltage and input current of a single LED chip has a certain range. Beyond this range, the LED chip will flicker.
  3. The temperature of the lamp is too high, and the power supply starts overheating protection.
  4. The lamps are not waterproof. Leakage of the lamp can cause damage to the LED or power supply.
  5. There is a problem with the line that controls the street light, particularly in the zero line. If the live line and the neutral line are reversed, and the street light has a self-inductive current.

An average LEd street light’s lumens range from 3000LM to 45000lm.

Usually, solar LED streetlights are available in 30W, 40W, 50W, 60W, 100W, 150W, 200W, 250W, and 300W wattages.

If you experience having a not working street light or you want to conduct LED street light troubleshooting, you can follow these steps:

  1. Streetlights are off:

First, check the circuit for problems. If there is no problem with the circuit, it is a power supply problem. To fix the issue, you have to replace the power supply.

  1. LED streetlights get darker:

A certain LED chip is burned, causing the LED chips in the same string to go out. The heat dissipation of the lamp is not good, resulting in the attenuation of the light efficiency of the LED chip.

  1. LED street light flickering:

For any concern about the light flickering, you can check the answer to the first RFQ.

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