<p>Smart Pole Infrastructure Solutions</p>

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Smart Pole

<p>Smart IoT Solutions for Street Lighting Management</p>

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Street Lighting

SmartCity

StreetLightingControl

SmartPole

GroupСontrol

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LEDLuminaires

DALItechnology

LightingControlSystems

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SmartLighting

UrbanInnovation

StreetLighting

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SustainableDevelopment

SafetyFirst

CrimePrevention 

UrbanPlanning

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CrimeReduction

CommunityDevelopment

LEDLighting

UrbanInfrastructure

SustainableCities

LEDStreetLights

UrbanLighting

SustainableLiving

TechInnovation

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EnergyEfficiency

LEDTechnology

AdaptiveLighting

<div class="raw-html-embed"><p>Light-emitting diodes (LEDs) are the most energy-efficient lighting technology available today. They last longer, disperse light effectively, and their brightness can be dimmed, which reduces light pollution and saves energy.</p>

<p>Cities are actively switching to LED lighting. For instance, Bristol is installing 29,000 LED lights without replacing the poles, aiming to complete the work by the end of 2025 <a href="https://www.bristol.gov.uk/residents/streets-travel/upgrading-to-led-street-lighting" target="_blank" rel="nofollow">[1]</a>. New South Wales, Australia, has already installed 217,000 LED lights as part of its smart street lighting program <a href="https://www.ausgrid.com.au/In-your-community/Streetlights/LED-Streetlight-Rollout" target="_blank" rel="nofollow">[2]</a>. Philadelphia, USA, is also transitioning to LED lights, with over 80% of the planned work completed, and a recent study (May 2025) has already shown a 21% decrease in street crimes involving firearms <a href="https://www.phila.gov/2025-06-16-an-update-on-philadelphias-key-climate-actions/" target="_blank" rel="nofollow">[3]</a>.</p>

<p>LED lights shine brightly, enhancing visibility and deterring offenders. But what happens if an LED light starts emitting purple light?</p>
</div>

<div class="raw-html-embed"><h2>Purple light from street LED lights: this shouldn’t happen</h2>

<p>If an LED light starts emitting purple light, it’s not a design choice but a result of a manufacturing defect in the light fixture.</p>

<p>LEDs themselves do not emit white light; they can produce red, green, yellow, or blue light. White LED lighting is created by mixing different wavelengths of light. Blue light from a blue diode passes through a phosphor layer. This fluorescent material absorbs some of the blue light and converts it into red and yellow. Consequently, the three colors (blue, red, and yellow) mix, and we see white light.</p>

<p>Unusual purple light is a direct indication of a defect. The issue occurs when the phosphor coating on the LED chips is damaged: small cracks appear, layers peel off, or, in the worst case, the chips are completely exposed. When the phosphor peels off, it ceases to convert the blue light, allowing it to escape and mix with the remaining light, resulting in a purple hue.</p>

<p>Such defective lights can be part of large batches supplied to utility services. For instance, the Canadian utility company Manitoba Hydro reported similar purple street lights in Vancouver, several U.S. states, and the UK <a href="https://www.hydro.mb.ca/articles/2022/11/whats_up_with_purple_street_lights/" target="_blank" rel="nofollow">[4]</a>.</p>
</div>

<div class="raw-html-embed"><h2>Is this a problem? Yes.</h2>

<p>Purple street light is unsafe for drivers and pedestrians. Proper color rendering of lighting is crucial for object recognition. Intense blue and purple light impairs the eyes’ ability to distinguish details since the center of the retina lacks cells sensitive to blue light. Moreover, a high proportion of blue light from street lights is detrimental to human health <a href="https://ehp.niehs.nih.gov/doi/full/10.1289/ehp.119-a472" target="_blank" rel="nofollow">[5]</a>.</p>

<p>Consequently, lighting that initially met industry and national standards no longer complies. Preventing purple glow once the defect has appeared is impossible. The only solution is to replace the defective light fixture, which incurs additional costs and diminishes trust in urban modernization projects.</p>
</div>

Photo shows an LED street light emitting a purple glow, likely due to a faulty phosphor coating, instead of the expected white light.

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<div class="raw-html-embed"><h2>How to prevent the problem of purple LED light</h2>

<p>To completely eliminate purple glow in street lights, a comprehensive approach to the lighting project is necessary, beginning from the earliest planning stages.</p>

<p>The LED chips used in street lights must undergo rigorous testing according to the LM-80 standard, which confirms their color stability and compliance with requirements. Additionally, request test reports for LED chips to ensure the reliability and durability of the lamps <a href="https://www.zgsm-china.com/blog/lifetime-of-leds-and-led-light.html#whats-lm80-and-whats-it-used-for" target="_blank" rel="nofollow">[6]</a>.</p>

<p>Select suppliers who provide a warranty covering defects caused by manufacturing flaws. This will enable free replacement of faulty lamps.</p>
</div>

<div class="raw-html-embed"><h2>Conclusion</h2>
<h3>Smart street lighting: beyond just light</h3>

<p>Street LED lamps offer numerous advantages, but they alone do not address all the challenges faced by municipalities. This is where <a href="https://streetlighting.sundrax.com/products/zhaga-gsm-node" target="_blank" rel="nofollow">Qulon street lighting systems</a> come in, delivering high performance and reliability, and unlocking the full potential of LEDs.</p>

<p>For instance, the Zhaga lighting controller, operating via GSM, features a built-in accelerometer that monitors the condition of the poles, preventing on-site breakdowns. At the zone and district level, the monitoring system offers highly accurate tracking of energy consumption parameters, flexible lighting schedule settings, analytics for further energy savings, and preventive maintenance.</p>
</div>

<div class="raw-html-embed"><h2>References</h2>

<ol>
  <li><a href="https://www.bristol.gov.uk/residents/streets-travel/upgrading-to-led-street-lighting" target="_blank" rel="nofollow">Upgrading to LED street lighting</a></li>
  <li><a href="https://www.ausgrid.com.au/In-your-community/Streetlights/LED-Streetlight-Rollout" target="_blank" rel="nofollow">LED Streetlight Rollout</a></li>
  <li><a href="https://www.phila.gov/2025-06-16-an-update-on-philadelphias-key-climate-actions/" target="_blank" rel="nofollow">An update on Philadelphia’s key climate actions</a></li>
  <li><a href="https://www.hydro.mb.ca/articles/2022/11/whats_up_with_purple_street_lights/" target="_blank" rel="nofollow">Manitoba Hydro – “What’s up with purple street lights?”</a></li>
  <li><a href="https://ehp.niehs.nih.gov/doi/full/10.1289/ehp.119-a472" target="_blank" rel="nofollow">The Mixed Blessing of Phosphor-Based White LEDs</a></li>
  <li><a href="https://www.zgsm-china.com/blog/lifetime-of-leds-and-led-light.html#whats-lm80-and-whats-it-used-for" target="_blank" rel="nofollow">How Long do LED Lights Last?</a></li>
</ol>
</div>

LED street light with a defect, glowing purple rather than white, possibly from an issue with the LED's phosphor layer.

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<p><span style="background-color:rgb(255,255,255);color:rgb(31,31,31);">Discover why some LED street lights glow purple! Learn about manufacturing defects, safety risks, and solutions in this insightful article on urban lighting issues.</span></p>

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Small street lighting cabinet/segment controllers

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<p>Street Light Controller QULON C1 is designed for remote diagnostics and control of street lighting systems.</p><p>For two-way communication with other devices and meters, Street Light Controller QULON C1 uses RS-485 interfaces. A 2G cellular connection is used to communicate with the QULON server.</p><p>The unit is powered from 110/220 V AC or 9-36 V DC.</p><p>The Street Light Controller QULON C1 can be configured remotely using the QULON control system and the DIP switches on the unit.</p><p>The unit is designed for DIN rail mounting in a lighting control cabinet.</p>

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Digital timer switch street light control - QULON C1

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Small street light controller – QULON C1 remote diagnostic panel

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Auto street light controller QULON C1 - energy-saving lighting

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IoT street light controller system - QULON C1 compact unit

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QULON C1 street light auto control system with remote access

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Street Light Controller QULON C1, AC, 2G, 2 relays, 3 inputs, RS

Street Light Controller QULON C1, DC, 2G, 2 relays, 3 inputs, RS

Mechanical

Power & Electrical

Environment

Interfaces and Protocols

Inputs / Outputs

Configuration / Indication

Package Contents

Street Light Controller QULON C1

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 Advanced street  lighting cabinet/segment controllers

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<p>Street Light Controller QULON C2 is the central controller of the QULON control system. It is designed to provide remote monitoring and control of all electrical equipment in the lighting control cabinet: magnetic starters, QULON system accessories, etc.</p><p>Street Light Controller QULON C2 uses RS-485 or CAN interfaces for two-way communication with other devices and meters. A 2G/3G/4G cellular or 10/100 Base TX Ethernet wired connection is used to communicate with the QULON server. The unit is equipped with a GPS module for time synchronization and geo-positioning.</p><p>The unit is powered from 110/220 V AC or 9-36 VDC.</p><p>Street Light Controller QULON C2 is remotely configurable using the QULON control system and the DIP switches on the unit.</p><p>The unit is designed for DIN rail mounting in a lighting control cabinet.</p>

Dimensional Scheme QULON C, QULON C2, QULON R, QULON MONARQ

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QULON C2 automatic street light controller panel with dimming

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Central control system for street lights - QULON C2 controller

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Intelligent street lighting controller QULON C2 with remote control

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CCMS street light control panel - QULON C2 for lighting cabinets

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Smart city street light controller QULON C2 with remote diagnostics

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Street Light Controller QULON C2, AC, 2G/3G/4G, 4 relays, 7 inputs, RS, CAN, Ethernet, GPS, Region: E

Street Light Controller QULON C2, AC, 2G/3G/4G, 4 relays, 7 inputs, RS, CAN, Ethernet, GPS, Region: A

Street Light Controller QULON C2, DC, 2G/3G/4G, 4 relays, 7 inputs, RS, CAN, Ethernet, GPS, Region: E

Street Light Controller QULON C2, DC, 2G/3G/4G, 4 relays, 7 inputs, RS, CAN, Ethernet, GPS, Region: A

Street Light Controller QULON C2

Why are some street lights purple?

<p>It's a well-documented fact that well-lit streets and public spaces deter crimes such as robberies, assaults, and vandalism. The presence of adequate lighting increases the perceived risk of detection by criminals, thus reducing their motivation to commit crimes. Moreover, residents and visitors to the city feel safer and more confident navigating through illuminated streets, contributing to a natural sense of communal control and vigilance.</p><p>Street lights also enhance the efficiency of police patrols and emergency responses, making it easier to spot suspicious activities and respond swiftly to incidents. Furthermore, good lighting helps in accident prevention by increasing visibility, thereby making city streets safer for both pedestrians and motorists.</p>

The Role of Street Lighting in Deterrence

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<p>In recent years, there has been a significant shift towards energy-efficient street lighting solutions. However, the challenge lies in finding the right balance between saving energy and ensuring adequate lighting to maintain safety. This balance can be achieved through meticulous planning and the adoption of innovative lighting technologies.</p>

Modern Trends in Street Lighting: Efficiency and Adaptability

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<p>The foundation of an efficient street lighting system lies in its planning. Conducting audits and zoning areas based on crime rates and vulnerability can help prioritize lighting needs. Designing lighting systems that take into account the specific characteristics of different areas—such as terrain, pedestrian routes, and population density—ensures that lighting is both effective and energy-efficient.</p><h3>Smart Lighting Solutions</h3><p>Technological advancements have introduced smart lighting solutions that offer adaptability and efficiency. For example, installing intelligent lighting systems in parks and pedestrian paths, which adjust based on motion detection, can significantly reduce energy consumption without compromising safety. Similarly, the use of real-time traffic data to regulate highway lighting can ensure optimal illumination when and where it's needed most.</p>

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Strategic Planning and Zoning

<p>Research consistently shows that improved street lighting can lead to significant reductions in crime, particularly in areas that are historically prone to higher levels of criminal activity. This underscores the importance of street lighting as a key component of urban safety strategies.</p><p>Moreover, the potential to save costs while maintaining, or even enhancing, safety levels through efficient lighting design and technology cannot be overlooked. Cities that invest in smart lighting solutions not only make their streets safer but also demonstrate fiscal responsibility by reducing energy consumption and lowering operational costs.</p>

The Impact of Well-Planned Street Lighting on Crime Reduction

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    <h3 style="color: #f65646; font-size: 28px;">
                                Conclusion
                                        
    </h3>
</div><p>Street lighting remains a vital element of urban infrastructure, playing a crucial role in deterring crime and enhancing public safety. By embracing modern lighting technologies and employing strategic planning, cities can create safer environments for their citizens without incurring prohibitive costs. Ultimately, the goal is to illuminate streets in a way that deters criminal activity, reassures the public, and fosters a sense of community—all while managing resources wisely. In the balance between cost and safety, well-planned street lighting systems show that cities do not have to compromise.</p>

<div class="raw-html-embed"><iframe title="QULON Blog. Street Lighting and Crime How to Save and Maintain Safety" allowtransparency="true" height="150" width="100%" style="border: none; min-width: min(100%, 430px);height:150px;" scrolling="no" data-name="pb-iframe-player" src="https://www.podbean.com/player-v2/?i=5uztf-16c19f9-pb&amp;from=pb6admin&amp;share=1&amp;download=1&amp;rtl=1&amp;fonts=Arial&amp;skin=f6f6f6&amp;font-color=auto&amp;logo_link=episode_page&amp;btn-skin=1b1b1b" loading="lazy"></iframe></div><h2>Striking the Balance Between Cost and Safety</h2><p>The interplay between street lighting and urban safety has long been a topic of interest among city planners, law enforcement agencies, and the public. Illuminated streets are more than just a feature of urban planning; they are a silent guardian of the night, dissuading potential criminals and forging paths of safety in the dark. The importance of street lighting in reducing crime can hardly be overstated, yet the challenge of managing costs while maintaining safety is ever-present. This article explores the crucial role of street lighting in crime reduction and offers insights into how cities can optimize their lighting systems to save money without compromising public safety.<br>&nbsp;</p>

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<h2>Striking the Balance Between Cost and Safety</h2><p>Explore the crucial role of street lighting in crime reduction and how modern, energy-efficient solutions offer cities a path to enhanced safety without breaking the bank.</p>

Street Lighting and Crime

Smart street lighting
and lighting control

Why are some street lights purple?

Street Lighting and Crime

Striking the Balance Between Cost and Safety

Shining a Light on Safety

How Street Lighting Deters Crime

Smart street lighting and lighting control

Why are some street lights purple?

Street Lighting and Crime

Striking the Balance Between Cost and Safety

Shining a Light on Safety

How Street Lighting Deters Crime

Smart street lighting
and lighting control