Case Study: How Solar Street Lights Cut Energy Costs by 92% for a Midwest Industrial Park

Real-world case study: An Ohio industrial park replaced 58 traditional lights with solar LEDs, saving $8,400 annually. See the ROI breakdown and project data.

Project: Oakridge Industrial Park Perimeter & Parking Lighting Retrofit
Location: Dayton, Ohio, USA
Challenge: The 25-acre park was lit by 58 high-pressure sodium (HPS) fixtures (250W each) on dedicated electrical circuits. Annual energy and maintenance costs were soaring, and outages were frequent due to an aging grid connection in the area. Management wanted a reliable, zero-grid-energy solution to lock in long-term costs and enhance security.

The Old System (Pre-2023):

58 HPS Fixtures: 250W each

Daily Operation: 12 hours (dusk-to-dawn photocell)

Annual Energy Use: 58 lights * 0.25 kW * 12 hrs * 365 days = 63,510 kWh

Annual Energy Cost (@ $0.11/kWh): $6,986

Annual Maintenance (bulb/ballast replacements): ~$1,500

Total Annual Operating Cost: $8,486

The Solar Solution Deployed (2023):
We supplied and installed 58 units of our “Guardian 120W” Integrated Solar Street Lights.

Luminaire: 120W High-Efficiency LED (16,000 Lumens, 4000K)

Solar Panel: 320W Monocrystalline, 22.5% efficiency

Battery: 98Ah LiFePO4 with integrated smart controller

Features: 3-step adaptive dimming (30%-70%-100%) with motion sensing.

Installation & Timeline:

No trenching, no grid connection. Each light was independently powered.

Foundations were poured, and poles were installed directly in existing light locations.

Project completed in 18 working days, with minimal disruption to park operations.

Measured Results (12-Month Period):

Energy Savings: 100% off-grid. $6,986 in electricity costs eliminated.

Maintenance Savings: No bulb changes or ballast repairs. Estimated savings: $1,500.

Improved Lighting Quality: Average illuminance increased from 15 lux (HPS) to 28 lux (LED), with a more uniform spread and better color rendering, enhancing CCTV camera effectiveness.

Reliability: Zero outages due to grid failures. The system operated through winter storms and summer heat waves.

Environmental Impact: Carbon reduction of approx. 45 metric tons of CO2 annually.

Financial Analysis:

Total Project Investment: $78,300 (includes lights, poles, installation).

Annual Operational Savings: $8,486 (energy + maintenance).

Simple ROI Period: ~9.2 years.

25-Year Net Present Value (NPV): Assuming a 5% discount rate and 2% annual grid inflation, the project has an NPV of over $52,000.

Client Feedback:
“The switch was a no-brainer. We fixed our unpredictable lighting costs for 25 years. The adaptive dimming is brilliant—it saves energy while making our security guards feel safer when they patrol. The lights just work.” – Mr. David Chen, Park Facilities Manager.

Key Takeaways for Similar Projects:

High Grid Electricity Rates (> $0.10/kWh) make solar ROI extremely attractive.

Integrated All-in-One Lights simplified installation and future maintenance.

Adaptive Controls are essential for maximizing battery life and energy savings without compromising security.

A professional site audit to map shading from buildings was critical for placing two lights on wind/solar hybrid systems.

Internal Link Suggestion: Interested in the specific model used in this success story? View the technical specs of our Guardian Series lights