SRESKY SLL-21 Solar Street Light Project in Nha Trang, Vietnam

Executive Summary

Against the backdrop of sustainable urban development, a solar lighting upgrade project at a major landmark plaza in Nha Trang, Vietnam, stands out. This project comprehensively adopted SRESKY’s SLL-21 solar landscape lights from the Honor Series, transforming traditional public spaces into a modern demonstration zone that is safe, aesthetically pleasing, energy-efficient, and environmentally friendly.

As a representative application of solar streetlights in Nha Trang, this case study analyzes the adaptability of the SLL-21 to tropical maritime climates across multiple dimensions—project background, technical solutions, implementation process, and outcomes—highlighting its exceptional performance in plaza lighting solutions. The system not only enhances public safety but also provides valuable insights for sustainable urban development and smart lighting, advancing green energy applications in overseas B2B markets.

I. Project Background & Needs Analysis

Nha Trang City, Vietnam, renowned as an international tourist hotspot, is celebrated for its tropical climate and abundant sunshine, yet faces challenges from frequent rainy seasons. This landmark square, centrally located, serves as a multifunctional hub for citizen recreation, cultural events, tourist distribution, and large-scale parking—a core showcase of Nha Trang’s urban image.

Spanning a vast area and welcoming over one million visitors annually, the square holds significant strategic importance. However, the existing lighting system suffers from multiple critical issues, necessitating urgent upgrades to align with sustainable urban development goals.

Legacy Lighting Challenges

1. High operational costs: Traditional high-pressure sodium or metal halide lamps consume large amounts of electricity daily, with estimated annual expenses reaching hundreds of thousands of dollars, placing a heavy burden on municipal budgets.

2. Maintenance complexity: Aging underground cable systems require specialized teams for troubleshooting, with maintenance costs averaging over 30% of total expenditures annually.

3. Environmental pressures: High-energy lighting conflicts with Vietnam’s national strategy promoting green energy. According to the Ministry of Energy, urban lighting accounts for 15% of the country’s electricity consumption, requiring a shift to low-carbon solutions.

4. Safety and aesthetics: Uneven illumination creates blind spots at night, increasing crime risks. Outdated fixture designs also fail to align with the square’s international image.

Core Client Requirements

• Economic efficiency: A solar-powered solution delivering “zero electricity costs” and low maintenance.

• All-weather reliability: Stable illumination during long rainy seasons or power grid failures.

• Technological advancement: Smart lighting integration for optimized energy management.

• Aesthetic harmony: Fixtures designed with vintage-inspired elegance to blend seamlessly with the plaza’s landscape, enhancing ambiance at dusk.

II. Technical Solution Design

To meet these requirements, the project selected the SRESKY SLL-21 Solar Landscape Light from the Honor Series. Delivering 3000 lumens of brightness, the SLL-21 effectively illuminated both the square and parking areas.

Key Technical Features

• Temperature Control System (TCS): Protects the lithium battery in extreme conditions (-20°C to +60°C). With a 14.8V 115.44Wh capacity, it prevents high-temperature degradation and extends cycle life to thousands of uses—ideal for Nha Trang’s climate.

• Adaptive Lighting System (ALS 2.4): Ensures over 10 days of illumination during continuous rainy periods by dynamically adjusting brightness (100%–15%), guaranteeing rainy season stability.

• Smart PIR Sensing: Two 120° wide-angle sensors (8m range) adjust brightness automatically. Dimming to 15% when idle, lights return to full power when motion is detected. Three programmable modes—M1, M2, M3—allow tailored operation for plaza traffic patterns.

• High performance & durability: Featuring 230lm/W LED chips, a 17.5V/19W monocrystalline solar panel, IP65 waterproofing, and IK08 impact resistance. Charging time is just 7.2 hours.

• Elegant design: “Return to the 18th Century” retro European styling with high-transmittance PC lenses creates a classical ambiance, harmonizing with the plaza’s palm trees and architecture.

Lighting Layout

Based on optical simulation, fixtures were installed at 3 meters height with 14-meter spacing, ensuring uniform illumination and eliminating blind spots. This scientifically distributed design significantly improved nighttime parking lot safety.

III. Project Implementation & Execution

Thanks to the SLL-21’s integrated design, trenching and wiring were unnecessary, cutting construction time to one-third of traditional projects.

Installation Process

1. Excavated foundation pits, inserted foundation cages, and secured with C20 concrete.

2. Mounted fixtures onto 76mm poles using matching screws.

3. Hoisted poles manually or mechanically, aligned with flanges, and bolted securely.

The process strictly followed SRESKY’s installation guidelines, requiring only basic tools and minimal disruption to plaza operations.

Commissioning & Optimization

• PIR sensor sensitivity and lighting modes were calibrated to match foot traffic in different zones.

• Parking areas adopted M2 mode (30% + PIR, then 15% + PIR until dawn) to balance efficiency and safety.

• Capacity indicators (green ≥70%, orange 30%–70%, red <30%) enabled rapid system checks.

This professional execution highlighted SRESKY’s service excellence in overseas B2B projects.

IV. Project Outcomes & Impact

• Public Safety: Uniform illumination improved visibility by 30%. Local police reported a 15% decrease in nighttime incidents.

• City Image: The retro-classic design of the SLL-21 became a scenic highlight, boosting tourism appeal.

• Community Vitality: Enhanced safety encouraged more nighttime activities, stimulating the night economy. Tourist growth is projected to rise 10% annually.

• Economic & Environmental Benefits: Achieved “zero” operational costs. Maintenance costs dropped to one-tenth of the previous system. Annual carbon emissions reduced by hundreds of tons, setting a benchmark for sustainable development.

• Long-Term Value: The SLL-21’s durability ensures over 10 years of operation, making it a strong investment reference for B2B clients.

V. Risks & Countermeasures

• Extreme Weather: With IP65, IK08, and sturdy mounting, the SLL-21 withstood 40m/s wind tests without damage.

• Performance Degradation: TCS and ALS technologies extend battery life beyond standard LiFePO4, ensuring five years of efficient performance.

• Vandalism Risks: IK08 resistance provides protection. Better illumination reduced vandalism by 20% in the project area.

Conclusion

The Nha Trang Landmark Square lighting upgrade successfully addressed economic and environmental challenges through the implementation of SRESKY SLL-21 Solar Landscape Lights.

This project establishes a benchmark across technical, social, and sustainability dimensions, proving that advanced solar landscape lighting harmonizes functionality, aesthetics, cost efficiency, and environmental responsibility.

By providing valuable insights for global urban green transformation, SRESKY continues to support overseas B2B clients in advancing smart lighting and sustainable urban development.