Smart LED Street Lighting Upgrade for City of Lisbon Municipal Infrastructure

Project Overview

The City of Lisbon embarked on a comprehensive municipal lighting modernization initiative to replace aging high-pressure sodium (HPS) and mercury vapor streetlights across its urban core, historic districts, and suburban corridors. Covering over 42,000 lighting points—including main avenues, pedestrian zones, bridges, and public squares—the project represented one of Portugal’s largest smart city infrastructure upgrades to date. With rising energy costs, aging infrastructure failures, and growing commitments to EU Green Deal targets, Lisbon sought a future-proof, scalable, and data-driven solution that balanced sustainability, public safety, and operational efficiency.

Key Challenges

Lisbon faced multiple interrelated challenges: outdated lighting systems consumed excessive energy—averaging 180W per fixture—with poor color rendering (CRI < 40) and inconsistent light distribution, contributing to nighttime safety concerns. Maintenance was reactive and labor-intensive, with no remote monitoring capability; lamp failures often went unreported for days. Light pollution exceeded municipal thresholds in residential neighborhoods, and the lack of adaptive controls prevented dynamic dimming during low-traffic hours. Furthermore, legacy infrastructure lacked interoperability with emerging smart city platforms, hindering integration with traffic management, environmental sensing, and emergency response systems.

Solution Delivered

We supplied and deployed a fully integrated smart LED street lighting system comprising 42,350 custom-engineered luminaires—each featuring 3000K–4000K tunable white LEDs (CRI > 75), IP66-rated aluminum housings, and built-in NB-IoT connectivity. The solution included:

• Modular LED Fixtures: Optimized optical design delivering uniform 30–50 lux illumination across sidewalks and carriageways, reducing glare and uplight by 82% versus legacy fixtures.
• Central Management System (CMS): Cloud-based platform enabling real-time monitoring, group scheduling, fault alerts, and energy analytics dashboard accessible to municipal engineers and city planners.
• Adaptive Dimming Logic: Motion-triggered and time-of-night dimming profiles—e.g., 100% at dusk, 70% midnight–5am, 30% during off-peak pedestrian hours—programmed per zone based on traffic density and land use.
• Future-Ready Hardware: Luminaires equipped with standardized Zhaga Book 18 sockets and embedded IoT gateways, supporting seamless integration of air quality sensors, noise monitors, and 5G small cells in Phase II.

All hardware met EN 13201-2:2020 road lighting standards and carried CE, RoHS, and IEC 62722-2-1 certifications.

Implementation Process

Deployment occurred in three phased rollouts over 14 months, coordinated with municipal traffic authorities to minimize disruption. Each phase included site surveys, pole retrofitting (retaining existing infrastructure where structurally sound), firmware provisioning, and CMS onboarding. Our engineering team conducted on-site commissioning and trained Lisbon’s municipal technicians on CMS operation, troubleshooting, and data export protocols. Integration with the city’s existing GIS platform enabled precise geotagging of every node and automated asset lifecycle tracking.

Project Outcomes

The upgrade delivered measurable, citywide impact within six months of full deployment:

• Energy reduction: 65% average energy savings—equivalent to 8.2 GWh/year, offsetting ~5,100 tons of CO₂ annually.
• Maintenance efficiency: 92% reduction in reactive service calls; predictive maintenance alerts improved mean time to repair (MTTR) from 72 to 4.3 hours.
• Public benefit: 40% improvement in nighttime visibility metrics (measured via photometric surveys), correlating with a 22% decline in reported pedestrian incidents in pilot zones.
• Operational transparency: Real-time energy and performance dashboards now feed into Lisbon’s annual Sustainability Report and support EU reporting obligations under the Energy Efficiency Directive (EED).

Client Feedback

‘This project transformed how we manage urban infrastructure—not just as lighting, but as intelligent nodes in our digital city fabric,’ said João Mendes, Director of Urban Infrastructure at Lisbon Municipality. ‘The reliability, scalability, and energy accountability delivered have set a new benchmark for municipal retrofits across Southern Europe.’