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

Swapping halogen lighting for LED cuts the electricity a fitting uses by roughly an order of magnitude at the same light output, and that ratio is set by the technology rather than by any tariff. In this report we decline to publish a pound figure per room, because the answer depends on a household's unit rate and its actual running hours, and instead set out the three step calculation so readers can produce a number that is genuinely their own. We explain why lighting energy in UK homes concentrates in halls, stairs and multi lamp kitchen arrays rather than spreading evenly, compare halogen, compact fluorescent and LED lamps on how they produce light and how much heat they release, and address the specification details that cause most changeover disappointment: colour temperature, dimmable rating and beam angle. The practical guidance prioritises conversion by running hours rather than by room, and explains why a rarely used lamp is not worth replacing early....