<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

IndividualСontrol

Solutions

Products

LEDLuminaires

DALItechnology

LightingControlSystems

LoRa

SmartLighting

UrbanInnovation

StreetLighting

Sustainability

SmartCities

SustainableDevelopment

SafetyFirst

CrimePrevention 

UrbanPlanning

PublicSafety

CrimeReduction

CommunityDevelopment

LEDLighting

UrbanInfrastructure

SustainableCities

LEDStreetLights

UrbanLighting

SustainableLiving

TechInnovation

EnergySaving

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>A modern street lighting management system is a modular solution that enables various methods. The two main approaches are:</p><ul><li>Control of groups of luminaires;</li><li>Individual dimming and per-lamp control of LED luminaires with two-way data exchange.</li></ul><p>Energy savings are achieved by optimizing the schedules for turning luminaires on and off and dimming without compromising visibility, for example, by providing light only when motion is detected in an area.</p><p>In practice, smart management reduces operational costs by optimizing operating schedules and individually configuring each object. Continuous monitoring, error logging, and event journaling reduce emergency maintenance costs and help plan routine maintenance, increasing system reliability.</p>

Smart Management – One of Many Advantages

<p>Intelligent lighting operates on four complementary levels: from built-in modules and electrical systems of luminaires to network monitoring of energy sources and consumers, and comprehensive communication applications for control<a href="#referens2"> </a><u>[2]</u>.</p><p>A smart system operates based on a set of rules that determine the behavior of luminaires depending on local (e.g., sensor readings) and global conditions (information from other devices). When conditions change, the device automatically adjusts its state.</p><p>A gateway, or gate, is a component for precise lighting system configuration. It allows remote setting of the required lighting level, creation of individual schedules, and flexible brightness adjustment of luminaires in various zones, including open spaces and tunnels. For example, <a href="https://streetlighting.sundrax.com/products/litouch-base-station-lite">the LiTouch long-range base station</a> is used for individual and remote management of a large number of luminaires, monitoring their status and energy consumption.</p><p>&nbsp;</p>

Urban street with modern buildings, streetlights, and a few trees, showcasing a safe and vibrant atmosphere

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Precise Monitoring, Advanced Control

<h2>A Smart and Tested Solution for Your City</h2><p>The management system offers a variety of solutions—zonal, adaptive, wired, wireless, and solar-powered—enabling convenient lighting deployment in almost any terrain. Combining high functionality with easy installation and intuitive interfaces, Qulon transforms the process of managing city lights.</p><p>You will receive a customized solution designed specifically for your city, with topology and methods that comply with all industry standards, as well as environmental and social requirements. During the pilot project phase, you will verify the functionality of all features, your staff will receive training to operate the system, and you can rely on round-the-clock support. These comprehensive and finely tuned solutions ensure energy savings, flexible management, and exceptional lighting resilience in your city.</p><div class="raw-html-embed"><ol>
  <li id="referens1">
    <a href="https://www.brighton-hove.gov.uk/travel-and-road-safety/roads-and-highways/street-lighting-improvements" rel="nofollow" target="_blank" style="color: #f65646; text-decoration: none;">
      Estimating Energy Savings in Smart Street Lighting by Using an Adaptive Control System – Soledad Escolar, Jesús Carretero and Stefano Chessa
    </a>
  </li>
  <li id="referens2">
    <a href="https://www.mdpi.com/1996-1073/14/11/3018" rel="nofollow" target="_blank" style="color: #f65646; text-decoration: none;">
      Intelligent Street Lighting in a Smart City Concepts—A Direction to Energy Saving in Cities: An Overview and Case Study by Konrad Henryk Bachanek, Blanka Tundys, Tomasz Wiśniewski, Ewa Puzio and Anna Maroušková 
    </a>
  </li>
</ol></div>

Conclusion

<p>Modern outdoor lighting management systems are more than just a means to turn lights on and off. They are comprehensive solutions that create comfortable and safe conditions in urban areas, on roads, and at industrial facilities, strictly adhering to national and industry standards.</p><p>The implementation of intelligent street lighting management systems, based on sensor networks and advanced monitoring, brings significant benefits. While model simulators show approximately 35% energy savings with adaptive behavior <code>[1]</code>, real-world projects implemented with Qulon solutions worldwide demonstrate impressive results: from 50% energy savings with group control to 85% in adaptive systems that adjust to environmental conditions.</p><div class="raw-html-embed"><script type="application/ld+json">
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Group Based Lighting Control LED luminaires in a park

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<p>Modern outdoor lighting management systems are more than just a means to turn lights on and off. They are comprehensive solutions that create comfortable and safe conditions in urban areas, on roads, and at industrial facilities, strictly adhering to national and industry standards.</p>

Smart Management of Street Lights for Energy Conservation

<p>Devices and groups of devices communicate with the central server via wired or wireless channels, and the CCMS software processes this data, allowing operators to monitor the status of each asset through a user-friendly interface in real time. The Centralized Control and Monitoring System (CCMS) provides an effective interface for seamless communication between operators and system components.</p><p>The system supports remote on/off control and brightness adjustment for individual or grouped luminaires, creating and editing lighting schedules, and setting optimal brightness levels for different urban zones based on the time of day. The CCMS automatically logs and processes emergency situations, maintains an event log, and generates detailed reports on energy consumption, operating time, and system efficiency. It also provides the ability to configure controller and sensor parameters, integrate with other urban platforms and IoT devices, and offers a flexible user access management system.</p>

Control panel for CCMS with various buttons and screens

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All Management Functions, Reporting, and Planning – CCMS for Urban Lighting

<div class="raw-html-embed"><iframe title="CCMS for Street Lighting: Enhancing Urban Illumination" 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=a78ig-18a0b54-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><p>The Centralized Control and Monitoring System (CCMS) is engineered for efficient administration and control of a city’s LED lighting network. It integrates the management of cabinet controllers, individual luminaires, dimming modules, gateways, and a variety of sensors into a single hub. The CCMS enables data-driven decision-making, optimizes lighting and maintenance schedules, and facilitates the planning of the scalability of the urban lighting system.</p>

<p>Discover how CCMS revolutionizes street lighting with remote control, energy efficiency, and data analytics for smarter urban environments.</p>

CCMS for Street Lighting: Enhancing Urban Illumination

Smart street lighting
and lighting control

Why are some street lights purple?

Smart Management of Street Lights for Energy Conservation

CCMS for Street Lighting: Enhancing Urban Illumination

NEMA Street Lighting Controllers: Powering Smarter, Sustainable Urban Environments

Unlocking the Efficiencies of Urban Lighting

Purpose of Street Lighting Control

Flickering Street Lights

Smart street lighting and lighting control

Why are some street lights purple?

Smart Management of Street Lights for Energy Conservation

CCMS for Street Lighting: Enhancing Urban Illumination

NEMA Street Lighting Controllers: Powering Smarter, Sustainable Urban Environments

Unlocking the Efficiencies of Urban Lighting

Purpose of Street Lighting Control

Flickering Street Lights

Smart street lighting
and lighting control