If your home or business still runs on halogen downlights or fluorescent tubes, you’re spending far more on electricity than you need to. LED technology has come a long way — better light quality, longer lifespan, and energy savings that pay for the upgrade within months rather than years.
Here’s everything you need to know about switching to LED lighting in London: what it costs, what’s involved, and when you need a qualified electrician.
Why Upgrade to LED?
Energy savings. A typical 50W halogen GU10 downlight can be replaced with a 5W LED equivalent producing the same brightness. That’s a 90% reduction in energy use per fitting. A kitchen with six halogen downlights running four hours a day costs roughly £75-£90 a year in electricity at 2026 rates. Switch to LED and that drops to around £8-£10.
Lifespan. Halogen bulbs last around 2,000 hours. A decent LED lasts 25,000-50,000 hours. In practical terms, that’s the difference between replacing bulbs every year and forgetting about them for a decade.
Light quality. Modern LEDs are available in warm white (2700K), neutral white (4000K), and everything in between. Colour rendering (CRI 90+) is now excellent — food looks appetising, skin tones look natural, and rooms feel warm.
Less heat. Halogen downlights run hot enough to be a fire risk in insulated ceilings. LEDs run cool, which also means your rooms heat up less in summer.
Common LED Upgrade Scenarios
Halogen to LED Conversion
The most popular job we do. Most London homes built or renovated between 2000 and 2015 are packed with halogen GU10 downlights. A halogen to LED conversion is straightforward in most cases: swap the lamps, check the transformer compatibility, and you’re done.
Where it gets more involved is when the existing fittings are non-fire-rated and installed in insulated ceilings. Building Regs now expect fire-rated downlights in these locations, so a proper upgrade often means replacing the fitting, not just the bulb.
Fluorescent to LED
Offices, garages, utility rooms, and commercial kitchens still full of fluorescent battens. The options are:
- LED tubes in existing fittings — retrofit T8 LED tubes that bypass the old ballast. Quick and cheap, but the fitting itself is often yellowed and tired.
- Complete fitting replacement — swap the whole fluorescent batten for a slim LED panel or batten. Cleaner look, better light distribution, and no ballast to fail.
New-Build and Renovation LED Schemes
If you’re doing a kitchen extension, loft conversion, or full refurbishment, designing the lighting from scratch with LED gives you far more flexibility. Recessed downlights, linear LED profiles, under-cabinet strips, and feature lighting can all be planned into the first fix wiring.
Dimming Compatibility: The Issue Nobody Mentions Until It’s Too Late
This is the single biggest cause of problems with LED upgrades. You fit new LED downlights, flick the dimmer switch, and get flickering, buzzing, or lights that won’t dim below 40%.
Why it happens. Most existing dimmer switches are leading-edge dimmers designed for halogen’s high wattage. A circuit that used to run six 50W halogens (300W total) is now running six 5W LEDs (30W total). The dimmer can’t handle such a low load.
How to fix it. Replace the dimmer with a trailing-edge (LED-compatible) dimmer. Brands like Varilight, Hamilton, and Retrotouch all make reliable LED dimmers. Budget around £20-£40 per dimmer switch.
Domestic vs Commercial LED Upgrades
Domestic
A typical London flat or house might have 15-30 light fittings. Most domestic LED upgrades take half a day to a full day depending on scope.
Commercial LED Lighting Upgrade
Offices, shops, restaurants, and landlord common areas are where the savings really scale up. A commercial LED lighting upgrade for a small office with 40 fluorescent panels can cut the annual lighting bill by £800-£1,200.
LED Lighting Installation Cost in London (2026)
| Scope of Work | Typical Cost (inc. VAT) |
|---|---|
| Lamp-only swap — 10 GU10 halogens to LED | £150 – £250 |
| 6 fire-rated LED downlights (supply and install) | £450 – £700 |
| Full kitchen LED scheme — 8-12 downlights + strips | £600 – £1,100 |
| Bathroom LED downlights (IP65, 4-6 fittings) | £350 – £600 |
| Fluorescent to LED panel (per fitting, commercial) | £80 – £140 |
| Whole-house LED upgrade (20-30 fittings) | £1,200 – £2,200 |
| Commercial office refit (20-40 LED panels) | £2,000 – £5,000 |
Smart Lighting Options
Philips Hue remains the most reliable ecosystem. Colour-changing bulbs, tuneable white, app and voice control via Alexa or Google Home.
Other options include LIFX (no hub required), WiZ (budget-friendly), and Casambi (Bluetooth mesh, popular in high-end residential and commercial).
See our garden lighting guide for outdoor smart lighting options.
Regulations: Part P and LED Work
Simple lamp swaps are not notifiable. New circuits, new fittings in bathrooms, or work in kitchens near sinks can be notifiable under Part P.
As an NICEIC-approved contractor, F&A Electrical self-certifies all notifiable work and issues the Building Regulations compliance certificate.
Why Use an Electrician for LED Upgrades?
Transformer and driver issues, fire-rated fittings installation, dimmer rewiring, and certification all require a qualified electrician. Electrical work done by unqualified people can invalidate your home insurance.
Book Your LED Lighting Upgrade
F&A Electrical provides free quotes for LED lighting upgrades across London. NICEIC accredited, Part P registered, fully insured to £5M, with 237 Checkatrade reviews averaging 9.7/10.
Get a Free Quote or call 07407 627542.