Lighting Running Costs UK 2026: LED vs Halogen per Room per Year

Replacing halogen lighting with LED reduces the electricity a light fitting uses by roughly an order of magnitude for the same light output, and that ratio is fixed by the technology rather than by the tariff. The rooms where the saving is largest are not the rooms with the most fittings, but the rooms where lights are switched on for the longest.

We are not going to publish a pound figure per room, because the answer depends on a household’s unit rate and on how many hours each fitting actually runs, and neither is something we can responsibly assume on a reader’s behalf. What this report does instead is set out the arithmetic clearly, using the wattages printed on the lamps themselves, so that anyone can apply their own tariff and their own habits and get a number that is genuinely theirs.

Key findings at a glance

• Mains halogen lamps and LED lamps are compared by light output in lumens, not by wattage, and the wattage gap for equivalent output is large.
• The saving from an LED swap is proportional to running hours, which is why hallway and landing fittings often pay back faster than living room lamps.
• Domestic lighting energy use in the UK is dominated by a small number of heavily used fittings rather than spread evenly across the house.
• Halogen and incandescent lamps release most of their energy as heat, which is why they warm a shade and why LED replacements feel cooler to the touch.
• Downlight heavy kitchens and bathrooms concentrate several lamps on one switch, so a single switch event can draw the load of an entire room.
• LED lamp life is quoted in rated hours, which means a low use fitting may never reach the point where the saving becomes noticeable.
• Dimming and colour temperature, not efficiency, are the two specification details most often overlooked when households change over.

How to work out your own running cost

The calculation has three inputs and no hidden complexity. Take the wattage printed on the lamp, divide it by one thousand to get kilowatts, multiply by the number of hours the fitting runs in a year, and multiply that by your electricity unit rate in pence per kilowatt hour. Your unit rate is on your bill, and the maximum most domestic customers on a standard variable tariff can be charged is governed by the price cap set by Ofgem, which is reviewed quarterly.

The reason this is worth doing yourself rather than reading an average is that running hours vary enormously between households. A hall light left on from dusk until bedtime through a British winter accumulates a very different total from a spare room lamp used a handful of times a month. The wattage difference between technologies is constant; the hours are not, and the hours are what turn a small difference into a meaningful one.

The multiplier is where the headline sits. For the same lumen output, an LED lamp typically draws a small fraction of the power a mains halogen lamp needs, because a halogen filament produces light by getting hot and most of the energy leaves as heat rather than as visible light. That is a property of the technology, and it applies equally to a bulb in a table lamp, a downlight in a kitchen or a linear lamp over a mirror.

Which rooms actually matter

Lighting energy in a UK home is concentrated, not distributed. Three patterns drive it. First, circulation spaces: halls, stairs and landings often have lights on for long stretches because nobody owns the switch. Second, multi lamp arrays: a kitchen ceiling with a row of downlights puts several lamps on a single switch, so the room draws a multiple of one lamp’s rating every time anyone walks in. Third, the evening room: living rooms run lighting for the longest continuous periods, though often through fewer, lower output fittings once lamps rather than ceiling lights are in use.

Bedrooms, bathrooms used briefly, utility spaces and spare rooms sit well below those three. That has a practical consequence: if you are changing lamps gradually rather than all at once, the order should follow running hours rather than room importance. A stairwell fitting that is on every evening will repay a swap long before a guest room lamp does.

It also affects where fixed lighting is worth rethinking altogether. Where a ceiling fitting is being used simply because it is the only source in the room, adding a lamp from the modern floor lamps UK range and using the ceiling light less can reduce running hours on the highest output fitting in the room, which is a behavioural saving on top of the technology one.

Comparing the technologies on specification

The table below compares the lamp types found in UK homes on the characteristics that determine both running cost and suitability. The values are lamp specifications rather than measured outcomes, and the comparison is deliberately qualitative where a precise figure would depend on the individual product.

Lamp technologies compared on how they produce light, their relative power draw for equivalent output, heat behaviour and practical notes.

The specification details that cause problems

Most disappointment with an LED changeover has nothing to do with energy. It comes from three specification choices made without thinking.

Colour temperature is the first. Halogen light is warm, sitting at the lower end of the Kelvin scale, and an LED lamp chosen at a higher colour temperature will make a room decorated in warm neutrals look flat and clinical. For living rooms and bedrooms a warm white lamp keeps the character of the room intact. Kitchens and home offices can carry a cooler lamp because the task benefits from it.

Dimming is the second. An LED lamp must be specifically rated as dimmable, and older trailing edge or leading edge dimmers designed for a halogen load may not operate correctly with the much lower load an LED presents. Flicker and a restricted dimming range are the usual symptoms, and the fix is normally the dimmer module rather than the lamp.

Beam angle and lamp shape are the third. A halogen candle bulb and an LED candle bulb of the same lumen output can distribute light very differently, which matters in a shade that is open at the top or in a ceiling lights UK fitting with multiple exposed lamps. Where light is being read by rather than looked at, as with a lamp beside a chair, a wider beam and a diffusing shade will be more comfortable than a brighter narrow one.

What this means for UK homes

Work out your own numbers before changing anything: lamp wattage divided by one thousand, multiplied by annual hours, multiplied by your unit rate. Do it for the hall, the kitchen array and the main living room lamp, and the priority order will be obvious.

Change the heavily used fittings first and leave rarely used rooms until the lamps fail naturally. There is no efficiency case for discarding a working lamp in a spare room that runs for a few hours a year.

Match colour temperature to the room rather than buying a single specification for the whole house, and check the dimmable rating before ordering anything that sits on a dimmer circuit. Where a room relies on one bright ceiling source, consider layering with table lighting instead: a pair of lamps from the modern table lamps UK selection will usually give a more comfortable evening room at a lower total load than a single central fitting run at full output. In kitchens and bathrooms, where fittings are grouped and switched together, treat the array as one decision rather than lamp by lamp, and think about whether every downlight in the row genuinely needs to be on the same switch. For the wider picture on fittings and finishes, our modern lighting UK range is organised by room, which mirrors the way running hours actually accumulate.

Methodology

This 2026 report was compiled from our editorial assessment as a UK furniture and lighting retailer, from published lamp specifications including wattage, lumen output and colour temperature, and from the standard method of calculating electricity cost from power, hours and unit rate. Where a monetary figure would have required assuming a household’s tariff or usage, we have set out the calculation instead of publishing a number. The electricity price cap referenced is the one set by Ofgem. This report does not include proprietary sales data, customer data or survey fieldwork.

Citing this report

Publications and websites may cite this analysis with credit to Furniture in Fashion and a link back to us, referencing the 2026 edition. The report is a specification led explanation of lighting running costs rather than a measured energy study, and we would ask that it is described accordingly.

Frequently asked questions

How much does it cost to run a light bulb for a year in the UK?

Multiply the lamp wattage by the hours it runs in a year, divide by one thousand to get kilowatt hours, then multiply by your unit rate in pence per kilowatt hour. Your unit rate appears on your electricity bill.

Are halogen bulbs still available in the UK?

Sales of many mains halogen lamp types have been restricted under UK energy efficiency rules, and LED equivalents are now the standard replacement across the common fittings and caps.

Why does my LED bulb flicker on a dimmer?

Either the lamp is not rated as dimmable, or the dimmer was designed for a halogen load and does not operate reliably at the much lower load an LED draws. Changing the dimmer module usually resolves it.

Which room should I convert to LED first?

The one with the most running hours, which in most UK homes is the hall, stairs and landing, followed by a kitchen with several downlights on one switch.

Does leaving a light on use less energy than switching it off and on?

No. With LED lighting there is no meaningful surge on switching, and the lamp draws power for as long as it is on. Switching off remains the simplest saving available.