As major cities worldwide drive initiatives for sustainable development and energy efficiency, LED street lighting has emerged as the preferred solution.

However, as street lights age, the maintenance or upgrading of street lighting systems becomes a practical municipal engineering challenge—one that directly impacts the daily lives of the entire community.

When undertaking maintenance or retrofitting projects for aging streetlights, our clients often face a choice between two options: retrofitting with LED street light modules or completely replacing the entire street lighting system.

This article compares these two solutions from the perspectives of cost and benefit to help you identify the option best suited for your specific project.

LED Street Light Module Retrofitting

LED modules constitute the core component of an LED streetlight, and LED module retrofitting involves replacing the LED light source within existing street light fixtures with new LED street light modules.

This option is typically more cost-effective, as it entails lower upfront costs, leverages existing infrastructure, and significantly boosts energy efficiency.

If you are unfamiliar with LED street light modules, please refer to this blog post:

(160 lumens per Watt 50w Led Street Light Module SMD 3030 PC Material)

Advantages of LED Street light Module Retrofitting

1. Cost Savings and Lower Expenses: LED street light modules are relatively inexpensive and can be integrated into existing street light fixtures with relative ease, thereby eliminating the cost of purchasing additional hardware (such as fixture housings, covers, etc.).

For municipal departments operating under fixed budgets, saving money means being able to accomplish more work with the same amount of funding.

For instance, in Hengyang City (Hunan Province, China), the adoption of "modular maintenance" allowed the municipality to increase its maintenance volume by 10%—without increasing its budget—while simultaneously ensuring an operational rate of over 99% for its streetlights.

2. Minimal Disruption: Since existing light poles and infrastructure are retained, the installation process is faster and causes minimal disruption to local traffic and residents' daily activities.

3. Promotion of Standardized Configurations: In the past, many cities utilized a wide variety of street light models, requiring maintenance teams to stock a cumbersome array of different spare parts. By promoting "modular maintenance," cities can gradually standardize the module interfaces, luminous efficacy, and physical dimensions of streetlights across the entire municipality. Should future malfunctions occur, the standard spare parts kept in stock by maintenance personnel will be universally compatible, thereby significantly reducing warehousing and procurement costs.

(The lighting service center in Hengyang City, Hunan Province, is implementing "modular repair")

Conditions and Preparations for LED Street Light Module Retrofitting

This option applies when the light source module or driver power supply is damaged, provided that the fixture's structural design supports module replacement.

If the original streetlights were not designed with modularity in mind—for instance, if the LED chips and the fixture housing are permanently welded together—then it is not possible to simply replace the module alone.

Although the modules themselves may be inexpensive, one must also consider their luminous efficacy and overall quality. A street light module with an extremely low price point but severe light decay—rendering it useless after just 2 or 3 years—could actually result in a higher total cost in the long run due to the need for frequent replacements.

Therefore, selecting high-quality modules—and factoring in the associated electricity savings—proves to be the most economically sound choice over the long term.

If your situation meets the criteria for this first solution and you are interested in pursuing it, we invite you to browse our client case studies or contact us directly at any time!

Full Fixture Replacement

"Full replacement" refers to the overhaul of the entire street lighting system, encompassing the light poles, wiring, fixtures, and control systems.

While this option entails a higher initial investment, it delivers substantial long-term benefits in terms of performance, energy conservation, and future sustainability.

Advantages of Full Replacement

1.  Upgrading the Streetlight System with New Technologies for Enhanced Energy Efficiency

Regardless of whether your existing infrastructure consists of traditional sodium lamps or older-generation LED fixtures, if your budget permits, you can leverage the latest technologies—such as automated fault detection, leakage protection, automatic power cutoff, intelligent controls, and dimming capabilities—to facilitate "smart" management.

This not only enhances convenience for citizens but also further amplifies energy-saving results. Furthermore, LED fixtures are inherently over 50% more energy-efficient than traditional sodium lamps; when combined with intelligent dimming systems, the overall energy savings rate can range from 35% to 75%.

For instance, a project in Hangzhou, Zhejiang Province, involving the retrofitting of 105,000 streetlights, resulted in annual electricity savings exceeding 60 million kWh; similarly, a project in Guicheng, Guangdong Province—covering 21,500 streetlights—yielded annual savings of 8 million kWh.

2.  Ensuring and Enhancing Lighting Quality

New street lighting fixtures, featuring professional light distribution designs, can effectively eliminate "zebra-stripe" patterns and dark spots on the roadway, thereby making nighttime driving and walking experiences safer and more comfortable. 

Furthermore, according to news published by the China Construction News Network, the average illuminance of the motorized vehicle lanes on Xiangji Temple Road in Hangzhou—following its renovation—increased by 110%, while overall road lighting metrics improved by more than 35% on average. This effectively resolved previous issues such as uneven illumination and pronounced "zebra-stripe" effects.

During typhoon events, Guicheng City maintained a streetlight operational rate of over 99.5%, truly achieving the goal of "staying open even in extreme weather."

3. Enhanced Environmental Adaptability

If your city experiences a prolonged rainy season with frequent heavy downpours, or if streetlights are to be installed in unique locations (such as on bridges), we recommend selecting an IP66 rating. This rating strikes an optimal balance between protection against powerful water jets and effective heat dissipation, making it the preferred standard for municipal road lighting today. 

For streetlights in regions with relatively dry climates or on standard road sections, an IP65 rating is entirely sufficient and helps keep costs to a minimum.

However, if streetlights must be installed in areas prone to submersion (such as riverbanks or low-lying zones with poor drainage), we recommend opting for IP68; otherwise, IP68 is generally not advised. This is because it introduces additional heat dissipation challenges and increased costs—factors that are unnecessary for standard road applications. (If you are unfamiliar with IP ratings, please refer to our blog post on the subject)

4. Reduced Maintenance Rates and Enhanced Safety

Traditional streetlights—or older-generation LED fixtures—typically suffer from high failure rates.

 Furthermore, if spare parts are discontinued, repairs often require "robbing Peter to pay Paul" or paying exorbitant prices to custom-fabricate replacements, resulting in significantly higher maintenance expenses.

In contrast, modern lighting fixtures feature a long-lifespan design; thanks to systematic engineering, their failure rates are drastically reduced.

Moreover, a citywide replacement initiative ensures uniformity across all streetlight models, allowing for the bulk procurement of spare parts.

This leads to substantial reductions in warehousing and management costs—eliminating the need for the complex, modular-design-dependent maintenance strategies often required for aging streetlights.

From a safety perspective, aging electrical wiring can lead to electrical leakage, short circuits, or even fires; the costs associated with liability claims and remedial repairs following such safety incidents can often reach astronomical figures. Furthermore, by simultaneously upgrading the wiring during a comprehensive replacement, this potential financial risk is effectively eliminated at the source.

(More than 20,000 municipal streetlights in Guicheng Subdistrict, Foshan City, Guangdong Province, have been upgraded)

Conditions for Full Replacement

Condition 1: Facilities have entered a phase of "systemic aging." If the LED street lights have been in service for 15 to 20 years or more—meaning not only has the light source aged, but the poles have rusted, wiring insulation has deteriorated, and control boxes have become obsolete—then a complete replacement is a more thorough and safer solution than merely replacing the LED street light modules.

Condition 2: There is a clear demand for "smart upgrades." If a city is actively advancing its "Smart City" initiatives and seeks to implement features such as remote control, on-demand dimming, and automated inspections, then a complete replacement presents the ideal opportunity to establish a multi-layered, fully functional lighting system.

Condition 3: A "unified planning" framework exists at the top-level design stage. A complete replacement is not merely a simple "like-for-like" swap; rather, it requires multi-stakeholder coordination. It involves optimizing the lighting layout in real-time based on urban development trends and changing resident needs, thereby ensuring the plan remains both adaptable and forward-looking, and allowing the streetlights to seamlessly integrate with the city's aesthetic and cultural identity.

Condition 4: A willingness to endure "short-term disruption" in exchange for "long-term benefits." A complete replacement project entails large-scale construction work, which may cause some temporary disruption to traffic flow. However, once completed, the low maintenance and operational costs—combined with stable, reliable lighting—over the subsequent 10 to 15 years will serve as the ultimate return on investment for the city.

(The lighting project for the northern extension of the Longjiang Road elevated highway in Changzhou, Jiangsu Province, has been fully illuminated)

Cost Comparison: LED Street Light Module Retrofits vs. Full Replacement

When deciding between an LED street light module retrofit and a full replacement, several key factors must be taken into account: initial costs, long-term savings, and maintenance requirements.

1. Initial Investment

LED Street Light Module Retrofit: Features lower upfront costs, making it suitable for municipal projects with limited budgets.

Full Replacement: Requires a higher initial investment, but yields significant long-term returns.

2. Long-Term Savings

LED Street Light Module Retrofit: Delivers noticeable energy savings and lower maintenance costs, though its overall energy efficiency may not be as high as that of a comprehensive replacement system.

Full Replacement: Although the initial cost is higher, a comprehensive replacement generates superior long-term savings by significantly reducing ongoing operational costs and minimizing future repair expenses. 

3. Maintenance and Upkeep

LED Street Light Module Retrofit: Since existing infrastructure is utilized, maintenance is relatively simple, and fewer components require replacement.

Full Replacement: Once the initial "break-in period" has passed, the stability of the new system requires minimal attention, offering superior reliability and performance.

Choosing between an LED street light module retrofit and a full replacement of a street lighting system depends on several factors, including budget, project scale, and long-term objectives. For smaller projects or situations with limited budgets, an LED street light module retrofit is an excellent choice.

However, if your goal is to maximize energy savings, enhance lighting quality, and ensure future technological sustainability, a full replacement may be the better option.

Conclusion

In summary, if your objective is to "resolve immediate faults and control current costs," replacing only the modules is a pragmatic choice; however, if you aim to "realize long-term benefits and drive urban modernization," a full system replacement represents a more strategically visionary investment.

FAQ – Frequently Asked Questions

1. What is the difference between an LED street light module retrofit and a full street lighting replacement?

A: An LED street light module retrofit involves replacing the light source within existing street light fixtures with LED street light modules, whereas a full replacement entails replacing the entire street lighting system—including the poles, wiring, and control systems. The former is lower in cost and faster to implement, while the latter offers maximized energy savings and advanced integration of smart lighting technologies.

2. What are the main benefits of upgrading street lighting using LED technology?

A: Upgrading street lighting with LED technology offers several key benefits:
①High Energy Efficiency: LED fixtures consume less electricity, thereby reducing utility costs.
②Longer Lifespan: LED fixtures have a longer operational life than traditional street lights, reducing replacement and maintenance expenses.
③Enhanced Safety: LED fixtures provide brighter, more uniform illumination, improving visibility and safety on the streets.
④Environmental Benefits: LED lighting reduces carbon emissions and aligns with sustainability goals.

3. What is the cost of an LED street lighting module retrofit?

Answer: The cost of an LED street lighting module retrofit depends on several factors, such as the number of fixtures, the existing infrastructure, and the specific type of LED modules used. On average, the cost of a module retrofit is lower than that of a full street lighting system replacement, making it a more economical option for municipalities with limited budgets.

4. How long does it take to upgrade street lighting using LED technology?

A: The time required to upgrade street lighting depends on the size of the project and the number of lights that need to be upgraded. Small projects may take only a few weeks, while large-scale urban redevelopment projects may take several months. Because it utilizes existing infrastructure, the installation process is usually faster than a complete replacement.

5. Does LED street lighting require maintenance?

A: Yes, it requires regular maintenance. LED lights typically have a lifespan of 50,000 hours or so, much longer than traditional lights. Maintenance typically includes occasional cleaning of the lampshades and checking for problems with wiring or the control system. Please refer to our previous blog.

6. Can LED street lighting be integrated with smart city technologies?

A: Yes, LED street lighting can be easily integrated with smart city technologies. Features such as remote monitoring, automatic dimming, and smart sensors can be added to LED street lights to achieve better energy management, improved safety, and reduced operating costs. Smart city integration also allows for data collection and real-time adjustments based on factors such as traffic, weather, or time.

7. What is the lifespan of LED streetlights?

A: Generally, the design lifespan of high-quality LED streetlights is typically 50,000 hours. In the LED industry, there's a common term: L70 standard. The industry typically defines the lifespan of a luminaire as when its brightness decays to 70% of its initial brightness. Therefore, 50,000 to 100,000 hours is only the theoretical lifespan of an LED light when it meets the L70 standard. At this point, it may still be lit, but the illuminance will no longer meet safety standards.

Furthermore, the lifespan of LED streetlights is also affected by factors such as the LED driver power supply, heat dissipation design, LED chip quality, IP protection rating, and environmental conditions.

In a word, if the LED power supply is replaced in a timely manner (every 5-7 years), its actual service life is approximately 8-15 years.