Lighting accounts for around 15% of a typical UK household’s electricity bill. That number surprises most people. It surprises them even more when they realise how much of that cost is coming from bulbs that should have been replaced years ago.
If you haven’t already made the switch to energy saving LED bulbs, you’re paying more than you need to every single month. And if you have switched but bought the wrong ones, you might not be saving nearly as much as you think.
Halogens Are Gone and Good Riddance
The sale of most halogen and fluorescent bulbs in the UK was banned back in 2023 as part of national energy efficiency targets. If you’re still using halogens anywhere in your home, they’re running out the clock and costing you money while they do it. A halogen GU10 spotlight typically pulls 50 watts. Its LED equivalent delivers the same brightness for around 5 or 6 watts. If you’ve got ten downlights in a kitchen, that’s the difference between 500 watts and 50 to 60 watts every time you switch the light on.
That’s not a marginal improvement. It’s a complete transformation of what that circuit costs to run.
The Wattage Trap People Keep Falling Into
Here’s a mistake that’s genuinely common. People see an LED bulb rated at 8 watts and assume it won’t be as bright as the 60-watt bulb it’s replacing. Wattage measures energy consumption, not brightness. Lumens measure brightness.
A decent LED bulb producing around 800 lumens will match a traditional 60-watt incandescent bulb almost exactly. The LED uses somewhere between 8 and 10 watts to do it. When you’re buying replacements, look at the lumen output on the packaging and match it to what you had before. Matching wattage to wattage will leave you with dimmer rooms and a vague sense that LED bulbs are rubbish, which they aren’t.
Ultra-Efficient LEDs Are Now a Thing
The A and B energy ratings introduced under the UK’s updated efficiency classifications represent a step change beyond standard LED performance. To qualify as A-rated, a bulb needs a luminous efficacy of at least 210 lumens per watt. Standard LEDs typically sit well below that.
These ultra-efficient bulbs use around 60% less energy than regular LEDs and more than 95% less than a traditional incandescent. The lamp life on the best ones now runs to 50,000 hours or beyond. For bulbs in frequently used rooms, that’s a fit-and-forget solution for well over a decade. The upfront price is higher. The running cost over that lifespan is considerably lower.
Colour Temperature Is What Most People Ignore
Photographs in product listings almost never capture colour temperature accurately and that creates a lot of disappointed buyers. Colour temperature is measured in Kelvin and it determines whether your room feels warm and inviting or cold and clinical.
Warm white sits around 2700K and suits living rooms, bedrooms, and dining areas. It’s the closest to the light that traditional incandescent bulbs produced and it’s the most forgiving for most residential spaces. Cool white, around 4000 to 5000K, is better for kitchens and home offices where task lighting matters more than atmosphere. Stick a cool white bulb in a living room and it’ll feel like a waiting room within a week.
The CRI rating matters too. Colour Rendering Index runs from 0 to 100 and measures how accurately a bulb renders colours compared to natural daylight. Anything below 80 will make your home look washed out. Go for 80 or above as a minimum and above 90 if the room has artwork, good furniture, or anything else where accurate colour actually matters.
Dimmers Need Matching Properly
Old dimmer switches were designed for the relatively high wattage loads that incandescent and halogen bulbs drew. Plug a low-wattage LED into an old trailing-edge dimmer and you’ll likely get buzzing, flickering, or a bulb that won’t fully switch off. It’s not the bulb that’s faulty. It’s the incompatibility.
Modern trailing-edge dimmers are designed for LED loads and work properly with them. Check the dimmer type before buying dimmable LEDs and confirm the bulb is actually labelled as dimmable. Not all LED bulbs are. Assuming they all are is one of the more reliable ways to end up back at the hardware shop within a fortnight.
Smart LEDs Are Actually Worth It Now
A few years ago, smart lighting was mostly a novelty. The systems were unreliable, the apps were clunky, and the cost was hard to justify. That’s changed considerably. Smart LED bulbs that work with Alexa and Google Home are now genuinely useful rather than just impressive to demonstrate to visitors.
Around 12 to 27% of UK households now use some form of smart lighting. Schedules that turn lights off automatically, motion activation in hallways, and dimming scenes that shift the same room from functional to atmospheric are all straightforward to set up and actually get used day to day. The energy savings stack up too. A bulb on a schedule that switches off when a room is empty doesn’t run for hours unnecessarily. Over a year, that adds up.
The Bulb Type Matters More Than the Brand
GU10 spots, bayonet cap, Edison screw, candle, globe, filament. Getting the right fitting is obvious. What’s less obvious is that different form factors suit different applications and the cheapest option in any category usually has trade-offs worth knowing about.
Filament LED bulbs look beautiful in exposed fittings. They’re not always the most efficient option in their category but they’ve improved significantly and the warm omnidirectional glow they produce genuinely isn’t replicable from any other type. If the fitting is decorative and visible, the filament style is usually worth paying a bit more for. If it’s a ceiling fixture behind a shade, spend the money on efficiency instead.
One bulb swap at a time adds up more quickly than people expect.
