Are LED Lights
Cheaper to Run?
Yes. LED lights are dramatically cheaper to run than halogen or incandescent equivalents. The honest 2026 UK figure is roughly 80 percent saving on electricity per bulb. A typical UK household saves £240 to £270 per year switching from halogens to LEDs.
LED bulbs are roughly 5 to 10 times cheaper to run than equivalent-brightness halogen or incandescent bulbs. At the current Q2 2026 Ofgem unit rate of 24.7p per kWh, a 10W LED costs 0.25p per hour to run versus 1.24p for a 50W halogen plus 1.48p for a 60W incandescent. Across a typical UK home with 25 to 35 bulbs running 4 hours daily, switching from halogens to LEDs saves £240 to £270 per year. LEDs also last 15 to 25 times longer, cutting replacement costs significantly across their lifespan.
The figures that matter
Saving vs halogen
LED uses around 15 to 20 percent of the electricity for equivalent brightness.
Cheaper to run
Per hour cost of LED versus halogen or incandescent equivalent.
Annual saving
Typical UK home of 25 to 35 bulbs switching halogens to LEDs at 4 hrs daily.
Lifespan
LED 15,000 to 50,000 hours vs halogen 1,000 to 2,000 vs incandescent 750 to 1,000.
Four things to consider
Watts plummet
Same 800 lumens needs 60W incandescent, 50W halogen or just 8 to 10W LED.
Lifespan compounds
Each LED lasts 15 to 25 times longer than halogen, slashing replacement costs across ownership.
Heat output drops too
Halogens run hot plus add to summer cooling load. LEDs barely warm. Indirect cooling saving.
Payback under 1 year
An LED bulb upgrade pays back in under 12 months at typical UK use rates.
Real UK running cost comparison: LED vs halogen vs incandescent
The running cost gap between LED plus older bulb technologies is one of the largest household efficiency wins of the past 15 years. Each bulb saves typically £7 to £11 per year compared to a halogen equivalent. Multiplied across an average UK home, the saving is significant.
Real numbers at 24.7p per kWh (Q2 2026 Ofgem cap), 4 hours daily use:
- 10W LED (60W incandescent equivalent). 14.6 kWh per year. Roughly £3.61 per year per bulb.
- 15W LED (100W incandescent equivalent). 21.9 kWh per year. Roughly £5.41 per year per bulb.
- 50W halogen (60W equivalent). 73 kWh per year. Roughly £18.03 per year per bulb. £14.42 more than LED.
- 60W incandescent (now rare). 87.6 kWh per year. Roughly £21.66 per year per bulb. £18.05 more than LED.
- UK home 30 bulbs at 10W LED. 438 kWh per year. Roughly £108 per year total household lighting.
- UK home 30 bulbs at 50W halogen. 2,190 kWh per year. Roughly £541 per year total household lighting. £433 more than LED.
Why the gap is so large. Old incandescent bulbs were essentially small space heaters that happened to glow. Around 90 percent of the electricity went on heat plus 10 percent on visible light. Halogens improved this slightly but still wasted most input as heat. LEDs use semiconductor junction emission which produces light directly with very little waste heat. The light output per watt difference is roughly 8 to 10 times.
Lifespan compounds the saving. Bulb cost matters too. A typical halogen lasts 1,000 to 2,000 hours. A typical LED lasts 15,000 to 50,000 hours. At 4 hours daily use that is 4 years for a halogen versus 30 to 90 years for an LED. The halogen needs replacing 10 to 20 times across the LED's single lifespan. Bulb purchase cost across ownership shifts from £50+ for halogens to £5 to £15 for the single LED.
What about up-front cost? LED bulbs cost more to buy than basic halogens (£5 to £15 versus £2 to £5) but the running cost gap pays back the difference in roughly 6 to 12 months at typical UK use. After payback, every additional year is pure saving. Across a 10-year ownership horizon, an LED replacing a halogen saves £140 to £170 per bulb in combined running cost plus replacement bulbs.
Indirect savings beyond electricity. Halogens run hot (50 to 90°C surface temperature) plus add to summer cooling load if you use air conditioning or fans. LEDs barely warm. Halogens also waste energy as heat that goes to the ceiling or the surrounding fitting rather than illuminating the room. Replacing halogens with LEDs typically reduces room ambient heat noticeably during evening use.
Real number ranges
Annual cost per bulb (UK 2026, 4 hrs daily)
Cost comparison across one bulb's life
Buy the bulb
Halogen £2 to £5. LED £5 to £15. LED costs more upfront but uses far less electricity.
First year saving
LED saves £11 to £18 per bulb in electricity over a halogen across 4 hrs daily UK use.
Halogen needs replacing
Halogen burns out at typically 1,000 to 2,000 hours. LED still on first lamp. Bulb replacement cost compounds.
Total saving
Across 10-year ownership LED saves £140 to £170 per bulb in combined running cost plus replacement bulbs.
Four reasons LEDs are dramatically cheaper
Far lower wattage for same brightness
10W LED produces same lumens as 60W incandescent or 50W halogen. 80 percent less electricity used.
15 to 25x longer lifespan
One LED replaces 15 to 25 halogens across its life. Bulb replacement cost drops dramatically.
Less waste heat output
LEDs lose almost no energy as heat. Halogens lose 90 percent. Indirect summer cooling savings too.
Payback in under a year
LED upgrade pays back the higher upfront price in 6 to 12 months at typical UK home use.
Compare the options
10W LED bulb
- ✓10W draw for 800 to 1000 lumens output.
- ✓0.25p per hour at 24.7p per kWh.
- ✓15,000 to 50,000 hour lifespan.
- ✓£3 to £4 per year at 4 hrs daily use.
- ✓£5 to £15 retail price per bulb.
50W halogen bulb
- ✗50W draw for similar lumens output.
- ✗1.24p per hour at the same Ofgem rate.
- ✗1,000 to 2,000 hour lifespan. Replaced 15 to 25x more often.
- ✗£17 to £19 per year at the same daily use.
- ✗£2 to £5 retail price but replaced often.
LED running cost is one of the most significant practical advantages of LED lighting. Our full LED Lights hub covers safety, troubleshooting, installation plus selection across LED bulbs plus strip lighting.
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This article is one chapter inside our complete LED Lights knowledge base. The hub covers safety, troubleshooting, installation plus selection across LED bulbs, strips plus tape lights for UK homes.
More on LED lights
Three further LED practical articles in the same hub group cover related questions. The first is how long do led lights last for the lifespan question. The second covers how do led lights work for the technology behind the saving. The third is what does led stand for in led lights for the basic terminology.