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Street lighting
LightingTechnology

Street Lighting: How to ensure long lasting brightness at low costs? (Visual guide)

by BuildingandInteriors February 2, 2021
by BuildingandInteriors February 2, 2021
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Tags: LED street lightingsmart street lightingsolar street lightingStreet Lightingstreet lighting polestreet lighting pole designstreet lighting project

Street lighting is an important infrastructural lighting form. Without proper street lights, travelling at night becomes a great challenge.

The purpose of street lights is to make it safer and more convenient for people to travel in the dark.

It is not an unknown fact that many major accidents occur at night on roads that do not have proper lighting.

Therefore, it won’t be wrong to say that the objective of street lights goes deeper than just illumination. But the job doesn’t end at installing street lights.

Their positioning, lighting, efficiency, and many other factors must also be taken into account carefully.

 

This article deals with the underrated yet extremely important aspects of street lighting such as:

1. Importance of street lighting

2. Types of street lighting

a. High-Pressure Sodium Street Lighting

b. Induction Street Lighting

c. CFL Street Lighting (Compact Fluorescent Lamps)

d. Led Street Lighting

e. Solar Street Lighting

3. Street lighting installation guide

a. Dimensions

b. Spacing

c. Light cone

d. Light source

e. Light pollution

f. Temperature

4. Smart street lighting system

a. Need

b. Functionality

 

1. Importance of street lighting

For a long time, street lights remained a luxury for just the big cities. However, people observed their benefits and gradually it became a necessity.

Street lights are important for the following reasons:

  1. Safety: It becomes easier for drivers to see pedestrians, animals, and other obstructions such as manholes and pits when there is proper illumination. So, the chances of accidents are reduced.
  2. Personal security: Mishaps and crimes tend to reduce on roads with effective street lights.
  3. Smooth traffic flow: Street lights clear the visibility of the road; thus, allowing smooth traffic.
  4. Glare reduction: A common issue with drivers is that they do not turn-off their high-beam vehicle headlights. This makes it extremely difficult for the other drivers coming from the opposite side to have a clear vision of the road. The street lights can help reduce the headlight glare greatly.
  5. Street aesthetics: The street light pole design comes in a wide range of antique and modern options. You can choose from this endless array of street light pole design to beautify your streets.

 

2. Types of street lighting

Street lights are essential infrastructural lights. They come in a wide range of options. Some of the types of street lights are:

 

a. High-Pressure Sodium Street Lighting

 

Street lighting bulb

HPS street lights

Image Source: Tachyon Light

 

The HPS street lights remain a common type of street light. They mix different gases to produce white light. Moreover, they also produce yellow-orange light.

 

Limitations

  1. They take a few moments to turn on.
  2. The HPS lights produce reddish colour at the end of their life.
  3. You need a transformer to regulate the current and change the voltage.

 

b. Induction Street Lighting

 

induction bulb

Induction street lights

Image Source: Suppliers Tree

 

The induction street lights have a long lifespan and energy efficiency. They are better alternatives to incandescent lights.

 

Limitations

  1. Has a very large size.
  2. Ineffective lighting control
  3. Cannot be used in areas with low heights

 

c. CFL Street Lighting (Compact Fluorescent Lamps)

 

CFL lights

CFL Street Lights

Image Source: Industricals

 

The CFL street lights mimic the look of the incandescent bulbs but they operate like fluorescent bulbs. CFL lights are good commercial building lights and street lights.

 

Limitations

  1. It requires a ballast for power regulation
  2. The lighting intensity reduces to half of its life cycle

 

d. LED Street Lighting

 

LED lights

LED street lights

Image Source: ElectroSchematics

 

LED street lighting is one of the most efficient lighting solutions. The long lifespan of over 50,000 hours makes the LED street lighting extremely useful.

LED street lighting produces white and blue lights. It does not need warm up time. Therefore, this eliminates the limitations of HPS lights.

LED street lighting does not produce toxic chemicals such as mercury lamps.

Unlike CFL lights, LED street lighting can be controlled by dimmers.

The heat emission is extremely less. This makes the lights efficient.

The only limitation with LED street lighting is the expensive upfront cost. However, the low maintenance cost and high-efficiency balance the installation cost quite well.

Read more about LED lights here. 

 

Other benefits of LED street lighting:

  1. Does not emit poisonous gases.
  2. Less glaring effect.
  3. High light output.
  4. Appropriate colour rendering.
  5. Weather sustainability
  6. Less light pollution

 

e. Solar Street Lighting

 

solar panels

Solar panels for solar street lights

Image Source: Blogging Junction

 

The solar street light integrates with its favourite LED lights to produce the most sustainable, efficient, and eco-friendly street light solution. These solar street light solutions reduce the expenses to almost zero. Therefore, they make more efficient street lights than LED.

 

Read more about solar lights here. 

The solar LED street lighting comes with combined benefits of LED and solar energy:

  1. The solar LED street lighting free of cost lighting.
  2. Using solar street light becomes easier as you can install them anywhere without having to worry about the main power source.
  3. The solar LED street lighting does not need an outlet to power it. These have solar panels that absorb sunlight and charge the solar batteries that provide ample illumination for 10-12 hours.
  4. All solar LED street lightings to make eco-friendly lighting solutions. These do not exhaust the natural resources. Moreover, they do not harm the environment.
  5. The best thing about solar LED street lighting is that it is safe as it does not interact with electrical power sources.

 

3. Street lighting installation guide

Now that we know all about the types of street lights, let us also understand the correct way of installing them. Simply installing street light poles on the street doesn’t do the job.

You need to make sure that the lights follow a set of guidelines.

lights design

Perfect lighting design

Image Source: ZD Net

 

a. Dimensions

The street lights must be arranged in such a way that it offers uniform illumination.

 

Height

 

street light project

No dark spots with proper spacing

Image Source: Global Designing Cities Initiative

 

The height of the street lighting pole designs varies according to the width of the street:

1. Standard height of street lighting pole design for sidewalks: 4.5-6 meter.

2. Standard height of street lighting pole design for narrow streets: 8-10 meter.

3. Standard height of street lighting pole design for wider streets: 10-12 meter.

 

b. Spacing

 

street lighting

Appropriate distance between street light poles

Image Source: Global Designing Cities Initiative

 

The spacing between two street light poles must remain 2.5-3 times the pole’s height.

Measure the height of the lighting pole and the width of the street to determine the spacing of lights for uniform coverage. Poles that are too distant result in dark areas.

 

c. Light cone

 

light bulbs

Ideal light cone

Image Source: National Park Service

 

The light cone refers to the path of light. It generally has the same diameter as the street light pole’s height from the ground.

Therefore, the height of the street light pole determines the ideal maximum distance between two street lights to avoid dark spots.

 

d. Light source

The light source greatly influences the street light’s effectiveness. LED street lights make the best light source for cost-effective and safe lighting.

 

e. Light pollution

To avoid light pollution, focus the lights directly onto the streets. This reduces glare and light pollution.

The shielded and cut-off fixtures use less energy with energy-efficient light bulbs.

 

f. Temperature

The colour temperature across the street light design project must remain consistent. For pedestrian paths, 3000 Kelvin makes the ideal temperature and for vehicular paths, it is 5000 Kelvin.

 

4. Smart street lighting system

 

smart lights

Intelligent Street Lights

Image Source: Lighting Manufacturer

 

a. Need

The current form of street lighting systems particularly solar street lighting systems is an excellent infrastructural lighting solution. However, it lacks the inbuilt mechanism to address various maintenance and repair issues on a real-time basis. A lot of electricity and money gets wasted because of lack of timely repairs and use of damaged and faulty systems.

This gives rise to the need of having a more robust street lighting system that is technology-driven. Such a system should have smart and intelligent elements that interact with each other on a real-time basis. This would, in turn, enable the smooth & real-time checking of the street lights, thus minimizing the use of damaged street lights.

Even with solar street lights, if one of the street light poles has an issue, the efficiency reduces. Sometimes, faulty street lights remain unchecked for a long time leaving the street in darkness and danger.

However, with a smart street light system, we can bring more to the table to benefit everyone. The smart street light system interacts at different levels for excellent performance:

  1. These smart street light systems offer solid data to the city managers regarding functionality, pollution, etc.
  2. These offer weather condition detection, dynamic lighting, adaptive lighting.
  3. Smart street lights use various kinds of sensors to detect movement, sound, seismic activity (detect earthquake), monitor traffic, and many other things.
  4. The city-wide lighting infrastructure works as a single intelligent lighting unit with real-time interaction.

 

b. Functionality

 

Smart Street Lighting

Smart Street Lighting

Image Source: Coolfire Solutions

 

Now that we have understood why we need smart street lights, we must also know how they work. The working of smart street lights becomes important to understand as it is quite different from the regular street lights.

When we talk about the interaction among the elements, we must know what comprises these elements.

The street light system has three main elements:

  1. Lamp
  2. Pole
  3. Power cabinet

 

Lamp

The lamp further contains three parts:

  1. Luminaire
  2. Light bulb
  3. Lamp driver

It is the lamp that majorly determines the electricity consumption of the entire street light system. Thus, LED street lighting lamps must be chosen over traditional HID lamps.

If you want to go a level up, you can install smart street light that has dimmers and sensors for maximum energy-efficiency.

These LED lights offer a specific value of luminance, uniformity, and glare. The microcontrollers handle the functions of the street lamps with their exclusive digital approach.

Therefore, the lamp’s well-being is managed effectively. The IoT-based interaction becomes two-way in smart street lights. You can send and receive commands & information from and to the street lamp.  The central service centre monitors all details such as the weather conditions, number of people and traffic in the area, condition of the road, etc. in real-time.

The smart sensors make it possible for the lamps to receive quick repair in case of any damage.

 

Street lighting pole

The street light poles remain a mandatory part of the entire system. An intelligent street light pole has smart sensors that connect the LED street light to the main control station for monitoring and fault diagnosis.

The poles record data such as temperature, air pressure, humidity, wind speed, noise levels, etc. These LED street lighting poles have display screens to display weather data.

Sensors and IoT devices can be mounted on street light poles for smoother and more effective communication between the control station and the street lights.

 

Power cabinet

Managing a large number of street lights seemed a major challenge. This issue was eliminated by clustering them into smaller groups with the help of a control panel. Later on, automated switches were added to these panels to reduce human intervention to the bare minimum.

These control panels or power cabinets get triggered by alarms in traditional lights and by photocells in solar LED street lights.

However, modern power cabinets have become smarter as they work in a two-dimensional way.

Firstly, they control a specific number of street lights.

Secondly, they also manage individual street light devices by linking them to smart sensors. The need for smart street lights arose because we need more efficient, less polluting, and more effective street lights.

The power cabinets of smart street lights offer segment-level control of more than 200 streetlights communicating as a single unit.

Additionally, they also offer individual lamp control that can detect real-time malfunction reporting, humidity, noise, light measurements, etc. So, you can check and fix any issue even before it can cause any severe damage.

 

smart street lights

Working of smart street lights.

Image Source: fossguru

 

Conclusion

The street light remains an inseparable part of the city. It is needed for the safety, security, feasibility, and beautification of the streets and roads. People feel much safer traveling at night. This not only makes it advantageous for the people living in the city but also enhances tourism and city-ranking globally.

The different types of street lights such as HPS lights, induction lights, and CFLs have been in use for quite a while. However, they come with their set of limitations such as warm-up time, emission of poisonous gases, high energy consumption, etc.

These drawbacks are done away with the introduction of solar LED street lights that consume solar energy and make energy-efficient solutions. The LED lights last longer than their alternatives and turn on immediately.

However, there’s more to street lights than just the lighting fixture. You need to calculate the distance, spacing, height, and other dimensions of the street light project design carefully. If the installation is done abruptly, it will result in dark areas and overly-bright areas.

Furthermore, the future of street lights, the smart street light system makes it possible to interact with the lights in real-time and fix an issue even before it actually surfaces.

All these details will definitely assist you in planning your street light design project efficiently.


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