<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

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StreetLightingControl

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LEDLighting

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LEDStreetLights

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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>
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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>One of the most noticeable problems with street lighting, even in major cities, is the use of worn-out poles. Reinforced concrete, wooden, and metal structures that fail to meet modern requirements can be replaced with strong, lightweight composite poles. Similarly, inefficient halogen and mercury lamps now have an energy-efficient alternative — LED lighting, which also requires more robust poles.</p><p>Despite the automation of street lighting using relays, photocells remain vulnerable. Their contamination and false triggering from external light sources, such as car headlights, lead to wasted resources and shortened system lifespan.</p>

Sleek, contemporary composite light poles installed along a city avenue, demonstrating durability and aesthetic integration with the urban landscape

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Outdated Systems — Resource Waste, Deterioration, and Harmful Effects

<p>Street lighting is characterized by significant energy consumption, which not only increases financial costs but also negatively impacts the environment through greenhouse gas emissions. This problem stems from outdated components and management methods. According to 2021 data, outdoor lighting consumes between 15% and 19% of the world's electricity, accounting for approximately 2.4% of humanity's annual energy resources and 5-6% of total greenhouse gas emissions.<a href="#referens1"><sup>1</sup></a> Given the growing demand for energy, implementing intelligent street lighting systems to reduce energy consumption becomes essential for sustainable urban development.<a href="#referens2"><sup>2</sup></a></p><p>Light pollution presents another significant challenge. Lamps operating at full brightness throughout the night contribute to sleep disturbances and circadian rhythm disruptions, increasing the risk of insomnia, depression, chronic fatigue syndrome, and other diseases and disorders. Additionally, excessive night illumination disrupts the life processes of plants and animals and negatively affects wildlife migration patterns. <a href="#referens3"><sup>3</sup></a></p>

Close-up of an advanced GSM Node control panel installed in a street lighting cabinet, showing the digital interface for remote management and monitoring.

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<p>The degradation of urban infrastructure, reduced comfort and safety for residents, and cessation of trade during dark hours are all consequences of failing to modernize street lighting. Uneven lighting due to outdated equipment creates dangerous conditions at night. Modernization using contemporary energy-efficient solutions addresses many street lighting problems.</p><p>We have already mentioned replacing lamps and poles, as these parameters are the most visible aspects, but this represents only a small part of the optimization process. Proper positioning of luminaires and improving their light distribution to achieve ideal illumination levels are equally important.</p><p>What lies behind these external changes? For a radical transformation, a comprehensive approach to the lighting system is necessary. Introducing innovative control mechanisms allows for flexible brightness adjustment based on external factors and needs. Combining different control methods or making an optimal choice of a single method represents a significant step toward eliminating problems inherent in traditional street lighting.</p>

Nighttime cityscape featuring properly distributed street lighting that illuminates pedestrian and traffic areas while minimizing light pollution to surrounding buildings and sky

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Systematic Approach for Comprehensive Problem Solving

<p>The common group method of lighting control, which may seem completely inflexible, can be made energy-efficient by reducing energy consumption by 50% through turning off groups of lamps during periods of low traffic — typically during late night hours in residential areas. Group controllers installed in existing control cabinets handle line diagnostics and energy consumption monitoring — therefore, the control system can be improved with relatively modest investment.</p>

<p>Building a more sophisticated system is typically undertaken during a fundamental redesign of street lighting and incorporates individual control with flexible brightness adjustment, enabling dimming capabilities. Lighting scenarios can be applied not only within districts but also along avenues, providing both optimal visibility and energy savings. Within this approach, a separate controller is installed for each luminaire, replacing the photocell — for example, the GSM Node with powerful functionality and expanded connectivity options. A modern wireless controller eliminates the problem of false triggering. It responds to environmental signals with unsurpassed accuracy, reducing wasteful resource use and preventing intrusive light pollution. Individual control delivers a high level of efficiency, safety, and comfort.</p>

Diagram showing the components of an individual street light control system with wireless connectivity, sensors, and dimming capabilities for adaptive lighting.

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NEMA GSM Node

<div class="raw-html-embed"><iframe title="Problems with Street Lighting" 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=c5war-1857123-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>Street lighting is a functional element of the urban environment and literally a symbol of civilization, ensuring safety and continuity of city life. Like any complex infrastructure, it faces numerous challenges. As spaces rapidly urbanize and urban landscapes expand and transform, systems established decades ago become obsolete.</p><p>The problems of modern street lighting extend far beyond archaic control systems and worn-out equipment. They are much deeper and broader, requiring a comprehensive approach and careful analysis to resolve.</p>

<p>Discover how advanced street lighting systems overcome traditional challenges like energy waste and light pollution. Our solutions reduce costs by up to 50%, and create safer, more sustainable cities. Learn about the latest innovations in street lighting modernization.</p>

Problems with Street Lighting

Smart street lighting
and lighting control

Why are some street lights purple?

Problems with Street Lighting

The Problems with LED Street Lights

Smart street lighting and lighting control

Why are some street lights purple?

Problems with Street Lighting

The Problems with LED Street Lights

Smart street lighting
and lighting control