<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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<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>
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<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>
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<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>
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<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>
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<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>Around the world, studies showing the positive effects of improved street lighting on crime statistics have been persuasive. In the United Kingdom, a landmark study conducted in the 1990s in Dudley and Stoke revealed a direct link between enhanced street lighting and a marked decrease in local crime rates. This inspired a wave of lighting improvements across various UK cities, premised on the foundation laid by the pioneering project.</p><p>Across the Atlantic, the United States mirrored these findings. Chicago's initiative to increase streetlight presence in high crime areas manifested in a dramatic 36% reduction in crime. Further reinforcing these results were similar endeavors in New York and Los Angeles, where brighter nights correlated with quieter and safer streets.</p><p>In the Netherlands, Rotterdam's early 2000s experiment served as another testimony to the power of light in combating crime, specifically through the extended evening hours. Such results have not only validated the impact of lighting but also established it as a key component in urban crime prevention strategies.</p>

A Global Perspective on the Illuminated Path to Safety

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<p>The influence of street lighting on crime reduction can be dissected into several critical factors:</p><p><span style="background-color:rgb(255,255,255);color:rgb(255,85,67);">• </span>Enhanced Visibility: Better lighting equals better visibility. This makes it significantly more challenging for potential criminals to operate under the cover of darkness, cutting down opportunities for theft, assault, and vandalism.</p><p><span style="background-color:rgb(255,255,255);color:rgb(255,85,67);">• </span>Deterrence Through Presence: A well-lit environment suggests busyness and vigilance. Perpetrators of crime are often deterred by the fear of being seen and possibly caught, rendering lit areas less appealing targets.</p>

Illuminating the Elements of Crime Reduction

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<p><span style="background-color:rgb(255,255,255);color:rgb(255,85,67);">• </span>Social Activity and Surveillance: Darkness often keeps people indoors, but vibrant street illumination encourages communal participation in public spaces after sunset. The "eyes on the street" principle comes into play here, with an increase in the number of informal observers contributing to the deterrence of criminal activities.</p><p><span style="background-color:rgb(255,255,255);color:rgb(255,85,67);">• </span>Community Confidence and Security: Light is reassuring; it instills a sense of safety that can embolden residents to take active roles in their neighborhoods. This sense of community guardianship is integral to deterring misdeeds and fostering neighborhood watchfulness.</p><p><span style="background-color:rgb(255,255,255);color:rgb(255,85,67);">• </span>Environmental Cues for Social Order: The "broken windows" theory posits that an area's physical deterioration can breed crime. Conversely, good lighting can be a signal of order and attentiveness to an area, curbing the inclination towards antisocial behavior.</p>

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<p>Illumination alone is not a panacea for crime. Effective lighting must be integrated within a multifaceted strategy that encompasses diligent maintenance, environmental design improvements, community engagement, and policing efforts. To be truly effective in crime reduction, street lighting needs to function optimally, react flexibly to the changing urban landscape, and coalesce harmoniously with broader public safety endeavors.</p>

Integrating Lights with Law: A Comprehensive Approach to Crime Prevention

<p>Light, it seems, is not just a metaphor for hope and transparency—it is a tangible deterrent against the darkness of crime. Street lighting, when expertly applied and embedded within a well-rounded public safety framework, can significantly contribute to creating environments where peace, order, and the well-being of citizens shine brightest. Through continued investment and innovation in urban lighting, cities can continue to enhance the safety and security of public spaces, a benefit that casts a luminous influence on the quality of urban living itself.</p>

<div class="raw-html-embed"><h3 style="color: #f65646; font-size: 28px;">Conclusion</h3></div>

<p>Street lighting has long been a fundamental feature of urban infrastructure, but beyond guiding nighttime navigation and enhancing the aesthetic appeal of our cities, it plays a pivotal role in ensuring public safety. The correlation between well-lit streets and crime reduction has been the focus of much research, with evidence across the globe highlighting the efficacy of illumination in creating safer communities. This article explores these findings and dissects the factors that make street lighting a potent crime deterrent.</p>

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<h2>How Street Lighting Deters Crime</h2><p>Discover how street lighting plays a pivotal role in crime reduction, backed by global studies from the UK, US, and the Netherlands. Dive into the factors that make well-lit streets a deterrent for crime and learn about the multifaceted approach to public safety in our comprehensive article on the effects of illumination on crime statistics.</p><p><br>&nbsp;</p>

Shining a Light on Safety

Smart street lighting and lighting control

Why are some street lights purple?

Shining a Light on Safety

How Street Lighting Deters Crime

Smart street lighting
and lighting control