Intelligent lighting platforms double as a network of advanced sensors, giving facilities managers live occupancy, environmental and fault data to cut energy use, speed up maintenance and future-proof estates. Here, Russell Vanstone, Product Manager – Connected Buildings at Legrand UK & Ireland, explains how integrated controls, open protocols and IT-led approaches deliver measurable operational savings.
Lighting controls are no longer just about controlling lighting. Over the past decade they have evolved into a networked layer that supports building-wide control, asset management and energy optimisation. For public sector estates where budgets, regulatory targets and service continuity all matter, treating lighting as part of a broader set of resources makes practical sense. Doing so enables facilities teams to draw on a steady stream of live data without installing separate sensing networks.
Connecting lighting into the energy ecosystem
When lighting controls use open protocols and integrate with building management systems, they become an instant source of operational intelligence. Real-time dashboards translate occupancy data, fault diagnostics and daylight levels into actionable insights: automatic dimming to reduce peak demand, alerts to plan maintenance before fittings fail, and occupancy-driven schedules that align heating and ventilation with real-world needs. This level of data availability is how lighting control is becoming integral to the public sector’s energy ecosystems — it supplies the inputs that energy managers need to control energy consumption and meet efficiency targets.
Modern multi-function sensors can incorporate presence detection, lux sensing and basic environmental telemetry. Alongside motion sensing, these devices can provide anonymised headcount estimates, patterns of room use and levels of daylight. Facilities teams can feed that information into space-planning, consider whether rarely used rooms should be repurposed, or link occupancy trends to HVAC schedules so it only runs when people are present. Where systems include temperature or humidity sensors, those readings can be surfaced on the same dashboard, reducing the need for separate monitoring hardware.
Putting the IT in Lighting
Lighting networks now function as IT systems as much as electrical ones, requiring the same focus on connectivity, security and data, offering three immediate benefits. First, a networked lighting estate can be managed remotely — faults are logged with diagnostic and location information, so engineers arrive with the right spares first time. Second, centralised configuration and software-led commissioning can speed up deployment across multi-site portfolios. Third, when lighting is an IP-attached element of the estate it becomes available to broader analytics platforms and enables consolidated energy reporting as well as automated responses that would be difficult to achieve through legacy electrical wiring alone.
Public buildings are repurposed more often than many planners expect. A classroom becomes a conference room; a civic hall is split into smaller lettable rooms. Wattstopper PLUS supports wired, wireless and hybrid options while also allowing luminaires and sensors to be reassigned in software to new room boundaries – minimising physical rewiring. Commissioning tools like Polaris Config speed up initial setup, while Polaris Monitor provides ongoing visibility. Together they let teams reconfigure scenes and occupancy profiles as layouts and use patterns evolve.
Viewing lighting as a flexible layer can reduce long-term cost. Phased refurbishments become feasible because new zones can be commissioned and integrated without complex reconfigurations. By using comprehensive status reporting and fault logs, proactive maintenance lowers the likelihood of emergency repairs and extends the life of components. Aggregated data builds a clear picture of energy use and asset health, helping estates managers focus on the priorities that deliver the best lifecycle return rather than chasing short-term savings.
What does optimised efficiency look like?
In practice, optimised energy efficiency would almost certainly include aspects such as scheduled dimming during low-occupancy periods to reduce energy consumption, automated load shedding tied to building-wide demand response, or remote diagnostics that cut time needed on site for engineers. For example, retail and high-footfall public spaces can benefit from reducing lighting when headcount dips. Similarly, offices can adopt scheduled scenes to lower energy use during lunch hours. These are pragmatic, measurable interventions that align with net zero commitments and everyday budget pressures.
Advanced lighting control platforms such as Legrand’s Wattstopper PLUS make automation, reporting and maintenance simpler while enabling growth and change. Choosing a supplier who supports technical design, full-service commissioning and training reduces implementation risk and ensures the system continues to deliver value long after the installation is complete – including commissioning assistance and support, both remote and on-site.
Practical, incremental, strategic
Modern lighting controls are a cost-effective route to more usable operational data, smarter energy use and lower whole-life cost. Treating lighting as an IT system — not just an electrical service – transforms how it can be designed, managed and integrated making buildings more adaptable, maintainable and aligned to evolving policy and occupancy demands. That mix of immediate operational wins and longer-term lifecycle savings is why lighting control should be carefully considered as part of any estates strategy.
For more on Wattstopper PLUS, see Legrand.co.uk.
This article appeared in the October 2025 issue of Energy Manager magazine. Subscribe here.
