By Alistair Brown, CEO of LumenStream
Last updated: 31 July 2026
Start your net zero plan with the lighting.
Across the 113 facilities we have upgraded so far, energy efficiency has improved by an average of 63.5%. A lighting upgrade needs no planning permission, installs around your operations, and can be funded entirely from the savings it creates.
This article compares lighting with the other first steps UK businesses weigh up (solar panels, electric vehicles and heat pumps), shows what the approach has delivered, and covers what comes once the lighting is paying for itself. It is written for the person who owns the sustainability number and has to defend the plan to a board.
Why start with lighting instead of solar panels or EVs?
Because lighting passes the five tests a finance director applies to any energy project: capital, planning permission, disruption, payback speed and measurability. The other common starting points each stumble on at least one.
Here is how the four options compare:
| LED lighting + controls | Solar PV | EV fleet | Heat pumps | |
|---|---|---|---|---|
| Upfront capital | Zero upfront through Lighting as a Service | Significant, or a long power-purchase commitment | High per vehicle, plus charging infrastructure | High, often with building fabric work on top |
| Planning permission | None for an internal lighting upgrade | Sometimes needed, plus structural and grid checks | Rarely for vehicles; sometimes for charging hubs | Sometimes, with space and noise constraints |
| Disruption | Installed in phased sections or out of hours | Roof access and grid connection works | Fleet replacement cycles and driver changeover | Heating offline during the changeover |
| Payback speed | Savings begin the month the system is commissioned | Years, depending on roof, orientation and export rates | Depends on mileage and duty cycles | Long, tied to the gap between gas and electricity prices |
| How you measure it | Metered kWh, before and after | Metered generation | Fuel and maintenance records | Heat metering, with seasonal variation |
The row that decides it for most boards is capital.
Solar, vehicles and heat pumps all need money before they save money. A lighting upgrade is the one project on this list that can be structured with zero upfront cost. The funding comes out of the reduction in the electricity bill itself.
The final section of this article explains how that works.
Measurability matters more than most sustainability plans admit.
A carbon claim is only as good as the meter behind it.
Lighting savings arrive as metered kWh: you know the load before, and you know it after. At the Q1 2026 average non-domestic rate of 24.14p per kWh (DESNZ), each MWh saved is worth roughly £240 a year off the bill. Numbers like that survive an auditor, a lender and a customer questionnaire.
There are also businesses where lighting is the wrong first step.
If you installed current-generation LED with sensors in the last few years and the lux readings still meet the design level, your next pound is better spent elsewhere.
The case is also weaker for very small premises and for buildings where process machinery dominates the electricity bill and lighting is a small slice of it. And because a service agreement runs for five years, you want to own the building or have at least five years left on the lease; if relocation is likely, buying outright makes more sense. If a survey shows the savings are not there, the honest answer is to start with something else, and we tell people exactly that when the numbers say so.
What results has a lighting-first approach delivered?
Across our client base so far: 24,703 MWh of energy saved, 6,347 tonnes of CO2 avoided, and 24,148 LED fittings installed across 113 facilities. Energy efficiency has improved by an average of 63.5%.
For example, at Oxfam, one of our UK customers, we upgraded the Milton Keynes distribution centre that handles their online business, donated goods and new goods. The project replaced 314 fittings, added motion sensors and daylight harvesting across every luminaire, and lifted energy efficiency by 50%. The site now saves 34 MWh and 23 tonnes of CO2 a year. At the current average electricity rate, that is roughly £8,200 a year that goes back into the charity's work instead of its electricity bill.
Working with charities taught us something about budget-conscious buyers: tight budgets clarify decisions rather than complicate them. When every pound is meant for the mission, an organisation cannot afford to keep wasting money on inefficient lighting. Zero upfront cost stops being a nice-to-have and becomes the only viable route to the upgrade.
Speed is the pattern across the portfolio.
At Transport UK, another one of our UK customers, we replaced 310 fittings at their London bus depot in three days. The site now saves 176 MWh and 118 tonnes of CO2 a year, a 65% increase in energy efficiency. Ken Fennell, Transport UK's Head of Facilities, said:
"The installation went very, very smoothly. It was done in three days over a weekend, which meant it was very much less disruptive for the operations on site, particularly as we are a major hub for training and recruitment on this site."
The same holds in heavier settings, where we deliver the upgrade in phased sections so production never stops. We cover how that works in Reducing Carbon Without Disruption: How LED Upgrades Cut Scope 2 in Industrial Facilities.
What comes after lighting?
Whatever your plan puts next, funded in part by the savings from step one.
That is the sequencing logic of Lighting First: the lighting upgrade cuts the electricity bill from the first month. That headroom makes the slower, more capital-hungry projects easier to fund and easier to defend at board level. Solar on the roof, chargers in the car park and heat pumps in the plant room all become easier to approve once step one is banking measured savings.
The deadline behind all of this is statutory.
The Climate Change Act commits the UK to net zero: the 2019 amendment raised the target to at least a 100% reduction in emissions by 2050, against 1990 levels. Every UK business plan now runs toward that date. The workable way to run at it is in steps, where each step helps pay for the next.
A lighting upgrade will not get you to net zero on its own. What it delivers is the first measured cut: kWh and CO2 you can report this year, while the bigger projects are still in planning.
If no one has looked at your estate since the first LED wave, start with The Ultimate Guide to LED Lighting Upgrades in the UK. It covers what an upgrade involves, what it costs and what it saves.
How do we start without capital?
With Lighting as a Service, you do not need capital at all.
We survey the site, design the system, fund the upgrade, install it around your operations and maintain it for the full term. You pay one fixed monthly fee out of the savings, with zero indexation. The full explanation of the model is in What is Lighting as a Service?
