Replacing conventional lighting with LEDs can deliver substantial energy savings for commercial buildings. But installation is only the beginning. An efficient LED fitting can still waste electricity if it remains switched on in an empty meeting room, illuminates an unoccupied warehouse aisle or operates at full brightness when natural daylight is already sufficient.
And as buildings become more flexible, with changing occupancy patterns and different activities taking place throughout the day, traditional lighting schedules may no longer reflect how spaces are actually used.
The UK’s Energy Technology List identifies occupancy detection and daylight-responsive dimming as two important ways that building lighting controls can reduce unnecessary electricity consumption.
For energy managers, the next question after upgrading to LEDs should therefore be: How much of our lighting is operating when it doesn’t actually need to be?
Answering that question can reveal opportunities to improve the return on a lighting investment without compromising safety, productivity or occupant comfort.
Start with Actual Building Use
The most effective lighting control strategy begins with understanding how a building operates.
An office may have predictable weekday hours but significant variations in meeting-room occupancy. A warehouse might operate around the clock while individual aisles are only accessed intermittently. A retail environment may require different lighting levels during opening, cleaning and restocking.
These differences should determine how lighting is controlled.
The Carbon Trust recommends examining operating hours, occupancy patterns and the suitability of different lighting controls before deciding how a system should function.
Energy managers should therefore review when lights are on, which areas are occupied and where lighting remains at full output unnecessarily.
A simple out-of-hours walkthrough can sometimes reveal obvious opportunities, such as permanently illuminated storage areas or lights operating long after the building has closed.
The objective is not simply to install more sensors. It is to match lighting operation to real demand.
Use Occupancy Sensors Where They Add Value
Occupancy and presence sensors can automatically switch off or dim lighting when an area is unoccupied.
They can be particularly effective in spaces where use is intermittent, including meeting rooms, corridors, toilets, storage areas and certain warehouse zones.
However, successful sensor deployment requires more than choosing a product with the appropriate detection range.
Energy managers should consider how people use the space, whether they remain relatively still and how long lighting should stay active after movement is last detected.
An office employee working quietly at a desk should not suddenly be left in darkness because a sensor has failed to recognise their presence.
Similarly, lights in a busy circulation area may need different settings from those in a rarely used storeroom.
Root3 Lighting & Electrical provides commercial lighting control solutions incorporating occupancy detection, daylight harvesting, scheduling and dimming, illustrating how different control technologies can be combined around the requirements of individual spaces.
The key is appropriate configuration rather than maximum automation.
Make Better Use of Natural Daylight
Artificial lighting does not always need to operate at full output during daylight hours.
Daylight harvesting systems use sensors to assess available natural light and adjust electric lighting accordingly.
This can be particularly useful in offices, education buildings, retail environments and other spaces with substantial windows or rooflights.
The UK Energy Technology List describes daylight detectors as systems that automatically reduce electric lighting output when sufficient daylight is available.
However, daylight distribution is rarely uniform.
Areas close to windows may receive significantly more natural light than deeper sections of a building.
That makes lighting zoning important.
If every fitting responds to a single sensor, some areas could become unnecessarily bright while others receive insufficient illumination.
Controls should account for the actual conditions across the occupied space.
Divide Buildings into Sensible Lighting Zones
Lighting zoning allows different areas to operate independently.
Rather than illuminating an entire floor or warehouse section, controls can activate only those areas where lighting is needed.
For example, a logistics facility may need continuous lighting at a packing station but intermittent illumination within adjacent storage aisles.
An office may require consistent lighting in occupied working areas while meeting rooms, breakout spaces and circulation routes follow different patterns.
The most effective zoning reflects activity rather than simply building layout.
A floor plan can show where spaces begin and end, but it does not necessarily reveal how people use them.
Energy managers should therefore examine working patterns alongside the physical arrangement of fittings and sensors.
The question should be whether each zone can provide appropriate light without unnecessarily illuminating neighbouring areas.
Use Dimming, Not Just Switching
Lighting controls are often associated with automatically turning lights on and off.
Dimming can offer greater flexibility.
Instead of operating at full output whenever a space is occupied, suitable LED systems can reduce brightness while maintaining the illumination required for the task.
This may be useful in areas with changing daylight levels, variable activity or different operating modes.
Dimming can also avoid abrupt changes that occupants may find uncomfortable.
For example, lighting in a corridor might operate at a reduced level when unoccupied and increase when movement is detected, where the design and safety requirements permit.
Energy managers should check that existing LED drivers and control systems are compatible with the proposed dimming approach.
Not every fitting supports every method of control, so technical compatibility should be established before additional equipment is purchased.
Review Time Schedules Regularly
Time-based lighting schedules can remain useful, particularly where occupancy follows consistent patterns.
But schedules established when a building first opens may become inaccurate as working practices change.
Hybrid working, extended opening hours, seasonal operations and changes in shift patterns can all affect when lighting is actually required.
The Carbon Trust notes that fixed time schedules can be poorly suited to flexible working arrangements unless occupants have appropriate local control.
Energy managers should periodically compare lighting schedules with actual occupancy and operational activity.
A system configured to illuminate an entire office floor from 7am until 7pm may be wasting substantial energy if only a small proportion of the space is occupied during parts of that period.
Scheduling should therefore support the building’s current use rather than preserve assumptions made years earlier.
Connect Lighting with Building Management Systems
Lighting controls can sometimes operate independently, but integration with wider building technology may create additional opportunities.
A building management system (BMS) can potentially coordinate lighting with occupancy information, operating schedules and other building services.
The Carbon Trust identifies building energy management systems as technologies capable of monitoring and controlling services such as lighting and HVAC, helping organisations optimise consumption.
E.ON offers commercial LED lighting and wider building and energy management solutions, including technologies for monitoring and controlling consumption across multiple sites.
xWatts operates within the building energy optimisation market, while Ignite Energy and Trident Utilities provide wider energy-management expertise relevant to assessing consumption and identifying efficiency opportunities.
Integration should have a clear purpose, however.
Connecting lighting to a BMS is only valuable if it enables better monitoring, control or decision-making.
Consider Temporary and External Lighting
Lighting control opportunities are not confined to offices and warehouses.
Car parks, construction sites, logistics yards and temporary operational areas may also benefit from intelligent scheduling and occupancy-responsive illumination.
Prolectric Services provides permanent and temporary off-grid solar lighting incorporating automated controls, remote monitoring and, in selected systems, motion-responsive operation.
For these environments, energy management may involve more than reducing grid electricity consumption.
Smart control can help extend battery autonomy, minimise unnecessary illumination and reduce the need for fuel-powered temporary lighting.
However, external lighting must continue to meet relevant safety, security and operational requirements.
Reducing energy use should never compromise visibility where people or vehicles need safe access.
Measure Performance Against a Baseline
Installing smart controls does not automatically demonstrate that an organisation has achieved the savings anticipated in the business case.
Those savings need to be measured.
Before making changes, energy managers should establish how lighting currently operates and, where practical, how much electricity it consumes.
That may involve sub-metering, lighting circuit data, control-system records or engineering estimates based on connected loads and operating hours.
After installation, the organisation can compare performance against that baseline.
The Carbon Trust’s guidance on digital energy-management technologies emphasises the importance of monitoring and benchmarking consumption to evaluate energy-saving measures.
Care is needed when interpreting results, particularly where occupancy, opening hours or other operating conditions have changed.
A reduction in lighting electricity use may reflect better controls, but it could also result from fewer people using the building.
Meaningful measurement should account for those differences.
Watch for Override and Configuration Problems
Lighting controls need to remain practical for building occupants.
If lights switch off unexpectedly or rooms are consistently too dark, employees may override the system.
Those overrides can gradually undermine the intended energy savings.
A permanently activated manual override might leave lighting operating continuously, while a poorly positioned sensor could repeatedly fail to detect activity.
Energy managers should therefore review complaints, override patterns and control-system faults.
The aim is to identify whether the problem lies with equipment, configuration or an unrealistic assumption about how the space is used.
A successful lighting control system should be easy for people to use correctly.
If occupants regularly find ways around it, the design may need to change.
Make Commissioning Part of the Investment
Lighting controls should be properly commissioned rather than simply installed and activated.
That means checking sensor coverage, occupancy delays, daylight response, dimming behaviour and operating schedules.
CIBSE’s LG14 guidance on controlling electric lighting covers design, specification, commissioning and handover, recognising that controls must be considered throughout the installation process.
Energy managers should establish who is responsible for commissioning, what tests will be completed and how the final settings will be documented.
This becomes especially important for multi-site organisations, where inconsistent configuration can make performance difficult to compare.
Root3 Lighting & Electrical offers lighting control design, installation and commissioning, including DALI-based and wireless technologies.
The initial commissioning process should also allow for adjustment once the building is occupied and real operating patterns become clearer.
Protect Lighting Quality and Safety
Energy savings should not come at the expense of suitable working conditions.
Lighting still needs to support the tasks undertaken within each space.
That may mean ensuring adequate illumination for detailed work, avoiding glare or maintaining appropriate visibility along circulation routes.
Emergency lighting also requires separate consideration.
Energy-saving controls must not interfere with emergency lighting systems or the safety functions they are required to provide.
When reviewing lighting settings, energy managers should involve appropriately qualified lighting specialists and consider applicable workplace standards.
The objective is to remove unnecessary lighting energy use, not necessary lighting.
Build Continuous Optimisation into Maintenance
A lighting control system should not be treated as permanently optimised after installation.
Buildings change. Teams relocate. Working patterns evolve. Equipment develops faults and sensors may need adjustment.
Periodic reviews can help ensure the controls still reflect actual demand.
Energy Efficient Solutions Group, Ignite Energy and Trident Utilities operate in the broader energy efficiency and management sector, providing potential support for organisations assessing energy performance and improvement opportunities.
For larger estates, monitoring may reveal sites where lighting continues to operate outside normal hours or where consumption differs significantly from comparable buildings.
These findings can support targeted investigations and adjustments.
The strongest energy savings often come from a series of practical improvements rather than one major intervention.
Questions to Ask Lighting Control Providers
Energy managers should consider:
- Which areas would benefit most from occupancy-based control?
- How will sensors be selected and positioned?
- Can the system distinguish different lighting zones?
- Does it support daylight harvesting and dimming?
- Are existing LED fittings and drivers compatible?
- How can operating schedules be adjusted?
- What manual override options are available?
- Can lighting integrate with existing BMS or energy-management systems?
- How will energy savings be estimated and verified?
- What commissioning and user training are included?
- How will faults and overridden settings be identified?
- Can the solution be expanded across multiple sites?
- How will necessary illumination and emergency lighting be protected?
- What ongoing maintenance and optimisation will be required?
Frequently Asked Questions
What are commercial lighting controls?
Commercial lighting controls are technologies that adjust electric lighting according to factors such as occupancy, daylight availability, schedules and user requirements.
Can lighting controls save energy after an LED upgrade?
Yes. LEDs reduce the energy needed to produce light, while controls can reduce how long lighting operates or how brightly it operates when full illumination is unnecessary. Actual savings depend on the building, its occupancy and existing controls.
What is daylight harvesting?
Daylight harvesting uses sensors to measure available natural light and automatically adjust electric lighting to maintain appropriate illumination while reducing unnecessary energy consumption.
Are occupancy sensors suitable for every workplace?
Not necessarily. Suitability depends on occupancy patterns, tasks and sensor positioning. Spaces where people remain still for extended periods may require different detection settings or control approaches from intermittently occupied areas.
How should lighting control savings be measured?
Savings can be assessed by comparing lighting electricity consumption or estimated operating energy before and after implementation, taking account of changes in occupancy, opening hours and other relevant conditions.
Product & Services Guide
Egg
Energy technology and installation provider offering solutions such as solar PV, EV charging and related energy infrastructure. Its services may be relevant to organisations considering lighting efficiency within a wider site energy improvement programme.
Website: https://www.egg.com/
Energy Efficient Solutions Group
Energy efficiency solutions provider supporting businesses seeking to reduce consumption and improve building energy performance. Buyers should confirm the scope of its current lighting and controls offering directly.
Website: https://eesgroup.co.uk/
E.ON
Energy provider offering commercial LED lighting, building management and energy monitoring solutions. Its wider energy-management capabilities can support businesses seeking to integrate lighting efficiency with broader building performance improvements.
Website: https://www.eonenergy.com/
Ignite Energy
Energy management specialist supporting commercial organisations with energy performance, monitoring and efficiency improvement. Its services are relevant to assessing and optimising building consumption, including identifying opportunities to reduce wasted energy.
Website: https://www.igniteenergy.co.uk/
Prolectric Services
Provider of permanent and temporary solar-powered lighting and off-grid energy technology. Its solutions include automated lighting controls, occupancy-responsive operation and remote monitoring for applications such as construction sites, logistics areas and external spaces.
Website: https://prolectric.co.uk/
Root3 Lighting & Electrical Ltd
Commercial lighting and electrical specialist offering LED installations, lighting design and intelligent lighting controls. Its solutions include occupancy detection, daylight harvesting, dimming, scheduling and integration with wider building systems.
Website: https://root3lighting.com/
Trident Utilities
Business energy consultancy providing utility management, procurement and energy-related services. Its capabilities may support organisations assessing consumption, expenditure and efficiency opportunities across commercial estates.
Website: https://www.tridentutilities.co.uk/
xWatts
Energy technology business included within the commercial lighting supplier category. Its energy optimisation capabilities may be relevant to monitoring and controlling wider building consumption; buyers should confirm specific lighting-control integrations directly.
Website: https://www.xwatts.co/
Make Every Hour of Lighting Count
An LED upgrade can make commercial lighting substantially more efficient.
But the full value of that investment depends on how the lighting is operated afterwards.
The most effective approach follows a continuous cycle: measure → zone → control → monitor → adjust
Understand existing consumption.
Divide lighting into areas reflecting actual use.
Apply suitable occupancy, daylight and scheduling controls.
Monitor performance.
Then refine the settings as building requirements change.
The objective is not to keep reducing lighting levels until electricity consumption reaches a minimum.
It is to ensure that appropriate lighting is available wherever it is needed, without consuming energy unnecessarily elsewhere.
LEDs determine how efficiently light is produced. Controls determine how intelligently it is used.
The Energy Management Summit brings together senior energy and sustainability decision-makers with relevant solution providers through pre-arranged one-to-one meetings, providing an opportunity to explore commercial lighting, intelligent controls, energy monitoring and wider energy efficiency solutions.
Related Reading
This is the second article in our October Commercial Lighting series.
Our first article, Commercial Lighting Systems: What Energy Managers Should Compare, explored how buyers should assess LED technology, lighting design, controls, maintenance, installation and whole-life value.
This follow-up moves from choosing the right lighting system to maximising its performance, focusing on occupancy, daylight, zoning, system integration and the continuous measurement of energy savings.
Sources
- UK Energy Technology List – Building Lighting Controls: https://etl.energysecurity.gov.uk/products/lighting/building-lighting-controls
- Carbon Trust – Lighting Overview Guide: https://www.carbontrust.com/our-work-and-impact/guides-reports-and-tools/lighting-overview-guide
- Carbon Trust – Better Business Guide to Energy Saving: https://www.carbontrust.com/our-work-and-impact/guides-reports-and-tools/better-business-guide-to-energy-saving
- Carbon Trust – Digital Technologies for Energy Management: https://www.carbontrust.com/our-work-and-impact/guides-reports-and-tools/digital-technologies-for-energy-management-a-buyers-guide
- CIBSE – LG14 Control of Electric Lighting: https://www.cibse.org/knowledge-research/knowledge-portal/lg14-control-of-electric-lighting-2023/
- E.ON – Commercial LED Lighting: https://www.eonenergy.com/business/building-and-energy-management/led-lighting.html
- Prolectric – Solar Lighting: https://prolectric.co.uk/solar-lighting/
- Root3 Lighting & Electrical – Lighting Controls: https://www.root3lighting.co.uk/lighting-control-services/
Image credit: https://unsplash.com/photos/green-and-black-metal-wall-Rt7s19GR390
