Commercial lighting is often presented as one of the more straightforward energy-efficiency investments. Replace older lighting with LED technology, reduce electricity consumption and benefit from longer-lasting fittings. The underlying principle is sound. Energy Saving Trust identifies LED lighting and lighting controls among the measures businesses can use to improve workplace energy efficiency, while the government’s Energy Technology List says upgrading conventional lighting to LED technology can deliver substantial cost savings. But a successful commercial lighting project requires more than replacing one lamp with a lower-wattage equivalent.
Lighting needs to provide the right illumination for the people, tasks and spaces it serves. It needs to operate when required and switch off or dim when it is not. Installation needs to minimise operational disruption, and the projected energy and maintenance savings need to justify the investment.
The buyer’s question should therefore not simply be: How much energy does this LED fitting use?
It should be: How can we provide the lighting the building actually needs using the least appropriate amount of energy?
Start with the Space, Not the Fitting
Different commercial environments place very different demands on lighting.
An office needs comfortable illumination for desk-based work. A warehouse may require appropriate lighting across high-bay storage and picking areas. Retail environments need to balance energy efficiency with product presentation and customer experience, while manufacturing sites may require lighting appropriate to detailed or safety-critical tasks.
External areas, car parks and pathways introduce another set of requirements.
That means a lighting specification should begin with how the space is used.
A site survey can establish existing fittings, light levels, operating hours, mounting heights, daylight availability and areas where lighting is currently inadequate or excessive.
Root3 Lighting & Electrical, for example, combines site surveys with lighting design, lux-level assessment, LED installation and smart controls across commercial and industrial environments.
The objective should be to design the required lighting outcome first and then identify the most efficient way of delivering it.
Understand the LED Business Case
LED technology can significantly reduce the electricity required to provide a comparable level of illumination to older technologies.
Energy Saving Trust describes LEDs as the most energy-efficient common lighting technology, while the government’s Energy Technology List says commercial upgrades from conventional lighting to LED can potentially deliver significant savings.
For energy managers, however, the business case should be calculated around the actual estate.
That means establishing: current lighting load → operating hours → electricity consumption → proposed load → expected saving
Electricity is only part of the calculation.
Older lighting may also require more frequent lamp replacement, creating maintenance expenditure and, in difficult-to-access locations, potentially significant labour or access-equipment costs.
Ignite Energy highlights both energy and maintenance reductions within its commercial LED projects and has delivered estate-wide lighting upgrades for large multi-site organisations.
A useful ROI calculation therefore considers energy, maintenance and expected equipment life rather than electricity consumption alone.
Compare Lumens, Not Simply Watts
Wattage measures the electricity consumed by a light source.
It does not measure how much light it produces.
Lumens provide a measure of light output, while lux describes the amount of light reaching a particular surface or area.
That distinction matters when comparing an existing installation with a proposed LED replacement.
Reducing wattage is only beneficial if the new design still provides suitable illumination.
A lower-energy fitting that leaves employees unable to perform tasks comfortably or safely is not an effective efficiency measure.
Buyers should therefore expect suppliers to demonstrate how the proposed design meets the lighting requirements of the space rather than comparing wattages in isolation.
Look at Lighting Quality
Energy performance is important, but people experience lighting rather than kilowatt-hours.
Buyers may need to consider factors including colour temperature, glare, uniformity and colour rendering alongside brightness.
Different environments will have different priorities.
Retailers may place particular importance on accurate product colours. Offices need comfortable lighting that does not create excessive glare around screens. Warehouses and industrial facilities require appropriate visibility across working areas.
Root3 provides designs for environments ranging from offices and warehouses to retail, education, industrial and specialist applications, illustrating why a single lighting specification cannot simply be applied to every commercial space.
The strongest lighting project reduces energy while maintaining or improving the quality of the environment.
Don’t Stop at LED
Replacing inefficient fittings with LEDs can create an immediate reduction in demand.
Controls can then reduce the number of hours those fittings operate unnecessarily.
The government’s Energy Technology List identifies two particularly important forms of building lighting control: presence detection, which can switch or dim lighting when an area is unoccupied, and daylight detection, which can reduce artificial lighting when sufficient natural light is available.
Other control options can include:
- Time schedules
- Zoning
- Dimming
- Scene setting
- Centralised control
- Building management system integration
Ignite Energy combines LED upgrades with lighting controls and BMS integration, allowing multi-site businesses to monitor and adjust lighting alongside other building systems.
E.ON similarly provides commercial LED lighting and control solutions within its wider building and energy-management proposition.
The opportunity is to move beyond efficient light towards efficient lighting operation.
Consider Occupancy Patterns
A meeting room used for two hours each day does not need the same operating profile as a 24-hour production area.
Neither does a warehouse aisle need to remain fully illuminated when nobody is working within it.
Understanding occupancy allows energy managers to identify where controls can generate additional savings.
This becomes particularly valuable across large buildings where staff cannot realistically be expected to switch every area manually.
But controls should be designed around users.
A poorly configured occupancy sensor that repeatedly switches lighting off while somebody is working is likely to frustrate employees and encourage workarounds.
Automation should make efficient operation easier, not make the building harder to use.
Use Daylight Where It Is Available
Artificial lighting does not need to provide 100% of illumination when daylight is already doing part of the job.
Energy Saving Trust recommends making greater use of natural light within workplaces where possible and identifies lighting sensors among the technologies businesses can use to improve efficiency.
Daylight harvesting controls can automatically reduce artificial lighting output as natural illumination increases.
This can be particularly useful in buildings with skylights, glazed façades or areas receiving substantially different amounts of daylight throughout the day.
The principle is straightforward: use artificial light to provide what daylight cannot.
Think Beyond Grid-Connected Lighting
Not every commercial lighting requirement needs a conventional mains connection.
External roads, car parks, walkways, compounds and temporary sites can create significant installation challenges where electrical infrastructure is not readily available.
Prolectric Services specialises in off-grid solar lighting and power, including permanent solar street lights, bollards and temporary lighting systems. Its lighting design service can provide site layouts and lux calculations for applications including commercial sites, pathways, car parks and infrastructure.
For suitable locations, solar lighting can avoid trenching, cabling and grid-connection work while also removing ongoing grid electricity consumption.
The comparison should therefore consider the complete infrastructure requirement rather than simply the price of the lighting unit.
A conventional fitting may appear less expensive until the cost and disruption of getting power to it are included.
Consider Lighting as Part of the Wider Energy Strategy
Commercial lighting does not exist in isolation from the rest of the estate.
Energy managers may simultaneously be considering solar PV, battery storage, EV charging, HVAC, BMS technology and wider energy-management programmes.
Suppliers such as Egg and E.ON provide broader commercial energy and clean-technology services alongside energy-management capabilities, while Energy Efficient Solutions Group operates across LED and emergency lighting, solar PV, EV charging and other energy-efficiency technologies.
Trident Utilities supports organisations with wider energy management, efficiency, procurement and net-zero strategy, while xWatts operates within building-energy optimisation and decarbonisation.
This broader view can be valuable when deciding where lighting sits within the capital plan.
An LED project with a relatively straightforward payback, for example, may form part of a wider programme containing technologies with different investment profiles.
The important point is to prioritise measures using evidence rather than installing technology simply because it is available.
Establish the Baseline Before the Upgrade
Projected savings need something against which to be measured.
Before installation, energy managers should establish the existing lighting load, operating hours and associated consumption as accurately as possible.
For a single building, that may be relatively straightforward.
For a national estate containing different generations of fittings, control systems and operating patterns, it can be considerably more complicated.
Ignite Energy’s approach combines energy data analysis with efficiency projects such as LED upgrades, while E.ON provides monitoring and building-energy-management capabilities designed to give organisations greater visibility of consumption.
Trident Utilities similarly works with businesses to improve energy efficiency across complex portfolios using energy data and wider management services.
A reliable baseline makes it easier to build the investment case and subsequently determine whether the project delivered what was promised.
Plan Multi-Site Rollouts Carefully
An organisation with hundreds of sites faces a different lighting challenge from a business upgrading one warehouse.
Multi-site programmes need to consider:
- Site surveys
- Standard specifications
- Local variations
- Installation schedules
- Operational disruption
- Project management
- Reporting
- Handover
Standardisation can simplify procurement and maintenance, but not every building will require precisely the same solution.
A retail store with extensive daylight may need a different control strategy from one located inside a shopping centre. Older sites may contain different wiring or emergency-lighting arrangements.
The strongest rollout therefore combines a repeatable programme with enough flexibility to respond to individual buildings.
Include Emergency Lighting in the Conversation
Commercial lighting projects can also interact with emergency-lighting requirements.
Emergency lighting has a different purpose from normal energy-efficient illumination: it needs to support safe evacuation and visibility when the normal supply fails.
Where a wider lighting refurbishment affects existing emergency provision, buyers should establish how compliance, testing and maintenance will be handled.
Energy Efficient Solutions Group and Root3 Lighting & Electrical both provide emergency-lighting capabilities alongside wider commercial LED services.
Treating emergency provision as part of the project from the beginning is preferable to discovering late in the installation that it requires a separate redesign.
Consider Installation Disruption
A lighting upgrade that delivers an attractive theoretical return can still create operational problems if installation is badly planned.
Retailers may need work completed outside trading hours. Manufacturing sites may need installations coordinated around production. Warehouses may have access restrictions, while healthcare and education environments can have particularly sensitive operating requirements.
Energy Efficient Solutions Group delivers lighting and energy-efficiency projects across live operational environments, while Ignite Energy has experience rolling out LED projects across large multi-site estates.
During procurement, energy managers should ask how installation will be phased and what the organisation needs to provide.
The implementation plan is part of the solution, not an administrative detail after the purchase decision.
Compare Whole-Life Value
The cheapest fitting does not necessarily produce the lowest-cost lighting system.
Buyers should consider:
- Purchase and installation cost
- Electricity consumption
- Controls
- Expected lifetime
- Maintenance
- Warranty
- Replacement availability
- Monitoring
- Disposal
- Project management
Product quality matters too.
A lighting system that loses performance prematurely or requires frequent replacement can undermine the original energy and financial case.
Energy managers should therefore request appropriate technical information and understand the warranty and support arrangements behind the proposed equipment.
The real comparison is not fitting price versus fitting price.
It is the expected cost and performance of the lighting system over its working life.
Questions to Ask Commercial Lighting Providers
Energy managers should consider asking:
- How will you assess our existing lighting and operating patterns?
- What lighting levels will the proposed design deliver?
- How much electricity is the current installation estimated to consume?
- What reduction is projected after the upgrade?
- Which assumptions are used in the ROI calculation?
- Which occupancy, daylight or other controls are recommended?
- Can the lighting integrate with our BMS or energy-management systems?
- How will lighting quality and user requirements be maintained?
- What warranties apply to the fittings and controls?
- What maintenance will the system require?
- How will installation be phased to minimise disruption?
- Can the approach be standardised across multiple sites?
- How will savings be measured after installation?
- Are off-grid or solar solutions appropriate for any external areas?
Frequently Asked Questions
Why is LED lighting more energy efficient?
LED technology converts electricity into light more efficiently than older incandescent and halogen technologies and can provide the required light output using substantially less electricity.
Should businesses replace all lighting with LED?
LED is appropriate for a very wide range of commercial applications, but the project should still be based on the lighting requirements of each space rather than a simple like-for-like replacement exercise.
What are smart lighting controls?
Lighting controls use technologies such as occupancy sensors, daylight sensors, schedules and dimming to adjust lighting according to when and where it is required.
How should commercial lighting ROI be calculated?
A business case should consider the existing and proposed energy consumption, operating hours, electricity cost, installation expenditure, maintenance requirements and expected equipment life.
Can commercial outdoor lighting use solar power?
Yes. Off-grid solar lighting can be suitable for applications such as roads, pathways, car parks and other external areas, particularly where installing a mains electricity connection would be costly or disruptive.
Product Guide
Egg
Commercial energy partner providing energy management, clean technology and managed services across business estates. Its wider proposition includes technologies such as solar, storage and EV charging alongside ongoing monitoring and management designed to reduce energy consumption and carbon.
Website: https://www.egg.com/
Energy Efficient Solutions Group
Energy-efficiency and decarbonisation specialist providing LED and emergency lighting alongside solar PV, EV charging and other energy technologies. EES Group delivers projects across public and private-sector estates, including live operational environments.
Website: https://eesgroup.co.uk/
E.ON
Energy provider offering commercial LED lighting and control solutions alongside wider building and energy-management services. Its capabilities include energy monitoring, BMS technology and broader energy-efficiency and decarbonisation programmes.
Website: https://www.eonenergy.com/
Ignite Energy
Commercial energy-management specialist providing LED lighting upgrades, controls, BMS integration and wider energy-efficiency services. Ignite has experience delivering large-scale lighting rollouts across multi-site commercial estates.
Website: https://www.igniteenergy.co.uk/
Prolectric Services
Specialist in off-grid solar lighting and power solutions, including permanent street lighting, bollards and temporary lighting. Prolectric also provides lighting design and site-specific lux calculations for commercial and infrastructure applications.
Website: https://prolectric.co.uk/
Root3 Lighting & Electrical Ltd
Commercial and industrial lighting specialist providing site surveys, lighting design, LED installation, smart controls, emergency lighting and electrical services across a range of working environments.
Website: https://root3lighting.com/
Trident Utilities
Energy-services provider supporting commercial organisations with energy management, procurement, efficiency, compliance and net-zero strategy across individual and multi-site estates.
Website: https://www.tridentutilities.co.uk/
xWatts
Building-energy technology company focused on reducing energy consumption and carbon across commercial real estate, working within an ecosystem that includes building controls, monitoring and energy optimisation.
Website: https://www.xwatts.co/
From Efficient Fittings to Efficient Lighting
Commercial lighting efficiency ultimately depends on three things: design → technology → control
The design establishes how much light the space actually needs.
Efficient technology reduces the electricity required to provide it.
Controls reduce the time and intensity at which artificial lighting operates unnecessarily.
That is why the strongest commercial lighting project is not necessarily the one promising the largest percentage reduction on a product datasheet.
It is the one that provides the right light, in the right place, at the right time, using as little energy as reasonably possible.
The Energy Management Summit connects senior energy professionals with relevant solution providers through pre-arranged one-to-one meetings, providing an opportunity to explore commercial lighting, energy efficiency, building controls and wider decarbonisation technologies.
Related Reading
This is the first article in our October Commercial Lighting series.
The follow-up will look at what happens after an efficient lighting system has been installed: how energy managers can use occupancy controls, daylight harvesting, zoning, schedules and energy data to reduce unnecessary operating hours and maximise the savings from commercial lighting.
Sources
- Energy Saving Trust – Energy Efficiency in the Workplace – https://energysavingtrust.org.uk/a-guide-energy-efficiency-in-the-workplace/
- Energy Technology List – Lighting – https://etl.energysecurity.gov.uk/products/lighting
- Carbon Trust – Lighting Overview Guide – https://www.carbontrust.com/our-work-and-impact/guides-reports-and-tools/lighting-overview-guide
- E.ON – Commercial LED Lighting – https://www.eonenergy.com/business/building-and-energy-management/led-lighting.html
- Ignite Energy – Commercial LED Lighting Upgrades – https://www.igniteenergy.co.uk/energy-management-services/energy-saving-implementations/led-lighting-upgrade-projects/
- Prolectric Services – Lighting Design – https://prolectric.co.uk/services/lighting-design-services/
- Root3 Lighting & Electrical – https://www.root3lighting.co.uk/
- Trident Utilities – Commercial & Property Energy Management – https://tridentutilities.co.uk/who-we-help/commercial-and-property
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