How much does it cost to run a halogen light bulb? (2026 price cap)

Typical rating and how we worked this out

This page uses a typical rating of 42W for a halogen light bulb; published figures for this appliance range from 28W to 70W. A halogen bulb is an incandescent-family technology and typically uses around 42W for the equivalent brightness of an 8W LED — roughly five times the electricity for the same light. The running cost follows the same formula used across this site: watts ÷ 1,000 × hours × unit rate. Typical use is modelled as 5 hours a day, which is how the per-day, per-week and per-year figures above were calculated — see the cost-to-run calculator to change the wattage, hours or region yourself.

Rate used: Ofgem price cap, 1 October to 31 December 2026, GB average electricity — 26.32p/kWh (excl. VAT, removed 1 Oct 2026–31 Mar 2027).

Cost by region

Same appliance, same use — ranked most to least expensive by region under the price cap:

East Midlands is cheapest at £19.44 a year; Merseyside and Northern Wales is most expensive at £21.35 a year — a gap of £1.92 for identical use.

How a halogen light bulb compares with similar appliances

Ranked by typical annual cost in lighting, GB average:

• halogen light bulb — £20.17 a year (this page)
• incandescent light bulb — £28.82 a year
• LED strip lighting — £11.53 a year
• Christmas lights — £28.82 a year
• LED light bulb — £3.84 a year

Three practical ways to cut the cost

1. Replace with an LED equivalent — most fittings, including GU10 spotlights, have a direct drop-in LED replacement
2. Reserve any remaining halogens for spaces used only briefly, like a cupboard or landing, until replaced
3. Avoid halogen downlights in rooms used for hours each evening — that is where the wattage difference adds up fastest

FAQs

How much does it cost to run a halogen light bulb for an hour?

1.1p at the GB-average rate (26.32p/kWh, 42W). One typical use — 5 hours a day — costs closer to 5.5p.

How much does a halogen light bulb cost to run per year?

Around £20.17 a year at the GB-average rate, assuming 5 hours a day — about 39p a week.

Which UK region is cheapest to run a halogen light bulb in?

East Midlands, at £19.44 a year, against £21.35 in Merseyside and Northern Wales — £1.92 apart for identical use, purely from the regional rate.

Does the exact wattage of my halogen light bulb change the cost much?

Yes — ratings range 28W–70W, so the top of that range costs about 2.5x the bottom. This page uses 42W; check your own rating plate.

Does the October 2026 price cap affect this figure?

Yes — figures use the Ofgem cap for 1 October to 31 December 2026. Electricity excludes VAT (removed 1 Oct 2026–31 Mar 2027); gas includes 5%. See the price cap page for the full breakdown.

Sources

• Heatable — how much energy do household appliances use — wattage and usage figures for this appliance.
• Ofgem — Energy price cap unit rates and standing charges (regional tables, read 12 September 2026).

Related

• Cost-to-run calculator and full A–Z — check any appliance or enter a custom wattage.
• Energy price cap, 1 October to 31 December 2026 — every region, every payment method.
• Back-billing calculator — if a bill for this or any appliance looks like it covers too many months.
• Free bill audit — if your overall energy costs look high regardless of any one appliance.