I. Project Background and Requirements Analysis
1.1 Project Background
As a key Eastern European nation, Ukraine has experienced significant impacts from geopolitical tensions and energy crises in recent years. Frequent disruptions to traditional grid infrastructure have made urban public lighting systems highly vulnerable. Power outages have become routine, particularly during the long, cold winters.
This project is located in a central urban park in Ukraine. Situated between the city center and surrounding residential areas, the park spans approximately 5 hectares and serves as an essential venue for nighttime walks, leisure activities, and family gatherings. However, the existing lighting infrastructure relied entirely on the grid, resulting in high installation costs and safety risks due to frequent outages. According to Ukraine’s National Energy Report, urban park lighting outages reached nearly 30% between 2022 and 2023, highlighting the urgent need for an independent, low-maintenance lighting solution.
The introduction of the Sresky HALO 2 series solar streetlights directly addresses this challenge. With its high-resilience design, this product line has helped transform the park from experiencing “dark interruptions” to achieving “green sustainability.” As a global leader in solar lighting manufacturing, Sresky has delivered solutions to over 100 countries, and this case further demonstrates its reliability in extreme environments.
1.2 Core Requirements Analysis
Project requirements are shaped by Ukraine’s harsh climate and the park’s urban function. The core needs include:
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Energy Independence: The park requires a solution with no cable digging or grid connection, relying entirely on solar power. This reduces installation costs and ensures uninterrupted lighting during power crises. Compared to traditional streetlights that require extensive cabling, the solar solution saves over 80% in infrastructure investment.
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Extreme Cold Climate Adaptation: Ukraine’s winter temperatures can drop below -15°C, with prolonged rain, snow, and overcast conditions challenging battery performance. The system must support reliable charging and discharging at -20°C to prevent capacity loss. Standard lithium batteries can lose up to 50% efficiency in sub-zero conditions, necessitating advanced temperature control technology.
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360° Omni-Directional Lighting: Park benches, pathways, and green areas require wide-angle illumination without blind spots. Lighting coverage must exceed a 30-meter diameter to ensure pedestrian visibility and reduce crime risks. According to IESNA standards, park illumination should reach at least 10–20 lux.
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Landscape Integration: Fixture aesthetics must harmonize with the park environment. The HALO 2’s disc-shaped, modern design enhances visual appeal while blending seamlessly with the surrounding landscape.
II. Technical Solution Design: Advantages of Sresky HALO 2 (SLL-26)
To meet these requirements, the project selected the Sresky HALO 2 SLL-26-V1 solar landscape luminaire. Delivering up to 6000 lumens and supporting installation heights of 6–12 meters, it is ideally suited for park lighting. Its advantages lie in light distribution, core technologies, and intelligent functionality.
2.1 360° Full-Coverage Light Distribution
HALO 2 features a disc-shaped structure that provides true 360-degree illumination, eliminating the blind spots typical of conventional streetlights.
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High Luminous Output: Equipped with 144 OSRAM 2835 LED chips, it delivers 6000 lumens. At a 6-meter mounting height, the illumination radius exceeds 20 meters, ensuring uniform light distribution across open park spaces.
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High Luminous Efficiency: With an efficacy of 190 lm/W, it provides superior brightness with lower energy consumption. Compared to traditional sodium lamps (~100 lm/W), HALO 2 saves over 30% energy. A 4000K neutral white light and CRI Ra 80+ ensure accurate color rendering and clear surveillance visibility.
This design is ideal for parks with dispersed layouts, ensuring shadow-free lighting at benches and pathway intersections.
2.2 Core Patented Technology Protection
Sresky’s patented technologies ensure HALO 2 performs reliably in Ukraine’s harsh climate.
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ALS 2.4 Intelligent System: Automatically adjusts brightness during prolonged cloudy or rainy conditions, ensuring more than 10 days of continuous illumination. While conventional solar lights last only 3–5 days, ALS optimizes battery usage to 95% through dynamic power control.
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TCS 1.0 Temperature Control Technology: Supports battery operation from -20°C to 60°C and charging from 0°C to 45°C. Built-in heating and smart temperature control prevent freezing, enabling over 2000 charge cycles. At -20°C, TCS maintains 40% higher capacity retention compared to batteries without temperature control.
The monocrystalline silicon solar panel (16.2V/75W, >21% efficiency) charges in approximately 6.7 hours, while the 461.76Wh battery capacity ensures strong energy backup even in low-light conditions.
2.3 Smart and User-Friendly Features
HALO 2 integrates intelligent features to simplify maintenance and operation.
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Built-in Bird Repeller: Prevents bird nesting through audio-visual alerts, reducing maintenance needs. Bird droppings can reduce panel efficiency by 20%, and this feature lowers annual maintenance costs by approximately 30%.
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Multiple Lighting Modes: Supports app control and manual switching. Default Mode M1 provides 100% brightness for the first 5 hours, then 20% brightness. Battery indicators (Green >70%, Orange 30–70%, Red <30%) allow real-time monitoring.
These features transform HALO 2 from a passive lighting device into an intelligent management solution suitable for large park environments.
III. Project Outcomes and Impact
3.1 Social Value
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Enhanced Safety: 360° illumination removes blind spots, making nighttime park areas significantly safer. Residents report extending nighttime park activities by over an hour.
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Urban Image Enhancement: The disc-shaped design adds a modern aesthetic, becoming a visual highlight of the park landscape.
3.2 Economic and Environmental Value
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Zero Electricity Costs: Solar operation saves approximately $5,000 per hectare annually in electricity expenses.
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Low Carbon Emissions: Each lamp reduces annual carbon emissions by approximately 200 kg, supporting UN SDG7 goals. Overall project carbon footprint reduced by 40%.
IV. Risks and Mitigation Strategies
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Extreme Snowfall Risk: Snow accumulation may block charging.
Mitigation: The tilted disc design promotes snow shedding, while ALS 2.4 ensures over 10 days of lighting even in snowy conditions. -
Long-Term Maintenance Risk: Outdoor exposure may cause wear.
Response: IP65 and IK08 protection, app-based monitoring, and Sresky’s 5-year warranty ensure long-term reliability.
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