Do LED Lights Save Money?

Last updated: 2026-04-05

The Answer

Yes. LED bulbs use 80–90% less energy than incandescent bulbs and last 15–25 times longer. Replacing a single 60W incandescent with a 10W LED saves approximately £8.70 per year (at 3 hours/day usage). For a typical home with 30 bulbs, switching to LED saves £200–300 per year on electricity.

The Short Answer

LEDs are the most cost-effective lighting upgrade you can make. The upfront cost (£3–8 per bulb) is recovered within 3–6 months through electricity savings alone. Factor in the dramatically longer lifespan — 15,000–25,000 hours versus 1,000 hours for incandescent — and LEDs cost roughly 10% of incandescent lighting over their lifetime.

The Full Explanation

The Maths, Per Bulb

Incandescent 60W bulb: £52.20 electricity over 5 years (3 hrs/day at 29p/kWh), plus 5 replacement bulbs at £1.50 each = £59.70 total. LED 10W equivalent: £8.70 electricity over 5 years, plus £0 replacements (LED lasts 15+ years at 3 hrs/day) = £8.70 total. That's an 85% cost reduction per bulb.

Whole-Home Savings

The average UK home has 30–40 light fixtures. Replacing all with LED saves £200–300 per year on electricity. The payback period for a full-home LED upgrade (30 bulbs × £5 average = £150) is typically 6–9 months. After payback, it's pure savings for the next 10–15 years.

When LEDs Don't Save Money

Specialty applications where LED equivalents are expensive (oven bulbs, specific vintage-style filaments) may not justify the switch. Very low-usage lights (closets, attics used minutes per month) save negligible amounts. In these cases, the existing bulb is fine until it fails.

Sources

1
LED vs Incandescent Cost Comparison
U.S. Department of Energy
2
UK Average Electricity Prices 2026
Ofgem
3
LED Lifetime and Reliability Data
Illuminating Engineering Society