Energy
The argument was settled twice - once by arithmetic, once by the fluorescent ban. In a room where the lights run 14-18 hours a day, LED paybacks run in months; the craft is doing it once, properly, in fittings that survive a kitchen.
Energy
Lighting is the rare kitchen upgrade where the argument has already been settled twice: once by arithmetic, and once by regulation. LEDs draw a fraction of the power of the fluorescent tubes they replace and last several times longer - and since the UK ban on producing fluorescent lamps took effect, the old tubes are a dwindling stock rather than an option. The question left for a kitchen is not whether, but when and how well - because in a long-hours kitchen the payback per replaced tube runs in months, making lighting the fastest yes on the energy list.
The arithmetic
Payback on lighting is a simple ratio - the cost of the swap against the energy no longer drawn - and every term in it favours a commercial kitchen. Hours: kitchen lights run from first prep to final cleandown, often 14-18 hours a day, so each watt saved is saved for longer than almost anywhere else in the premises. Rates: business electricity in the 18-26p per kWh range makes each saved kilowatt-hour worth more than it was when the fluorescents went in. And maintenance: a lamp that lasts several times longer means several times fewer ladder jobs above cooklines and wash-up sinks, which is a labour and safety saving the energy arithmetic never even counts. A worked example on typical numbers makes the point: an old twin-tube fluorescent batten drawing around 130 watts with its control gear, swapped for an LED batten nearer 40 watts, saves roughly 90 watts. Across a 16-hour kitchen day that is about 1.4 kWh, or around 35p at mid-range business rates - call it GBP 120-130 a year, per batten, for a fitting that costs a fraction of that installed in quantity. Multiply by a ceiling full of them and the first year pays for the project; every year after is margin. To keep the appraisal honest, though, know what lighting is not: it is a modest slice of a kitchen's total energy - refrigeration, cooking and ventilation dominate the bill - so LED is the fastest payback, not the biggest prize. It earns its place by being nearly effortless, not enormous.
The craft
The arithmetic is the easy half; the kitchen is the hard one:
Controls finish the job the hardware starts: occupancy sensors in dry stores, walk-ins, cellars and back corridors catch the lights that burn all night in rooms nobody stands in, and they retrofit as easily as the lamps themselves. It is the same logic as the tubes - small, certain, and paid back before anyone has stopped noticing the brighter room.
The decision
The ban converts this from an optimisation into a timetable: fluorescent stock can still be sold until exhausted, but availability shrinks and prices climb, and a kitchen limping tube by tube toward forced replacement pays for the transition twice - in dying-lamp maintenance and in an unplanned swap at the worst moment. The better version is one planned visit: audit the fittings, upgrade the lot, claim the capital allowances the tax system offers on integral features, and bank the saving every trading day after. As energy projects go it is small, quick and certain - the sensible first line on the list, provided the rest of the bill gets read too. One planning note earns its place: the same visit that upgrades the lamps is the cheapest moment to test and upgrade the emergency lighting they sit alongside, because the ladder, the electrician and the ceiling access are already paid for.
Questions
Usually months rather than years per replaced tube, because kitchens stack every favourable term: lights running 14-18 hours a day, business electricity at 18-26p per kWh, LEDs drawing up to 80% less than the fluorescents they replace, and lamp lives of around 50,000 hours cutting maintenance visits. The exact figure depends on hours and rates, but lighting is reliably the fastest payback on a kitchen's energy list - just not the largest saving in absolute terms.
Only from existing stock. Placing new CFL, T5 and T8 fluorescent lamps on the UK market was banned from 1 February 2024 under the RoHS rules on mercury, so what remains is a shrinking supply at rising prices. Spent tubes are hazardous waste and must be recycled under the WEEE rules rather than binned - which is one more running cost the LED replacement retires.
Phoenix Duct Clean · by the numbers
Lighting is the fastest payback; extraction is the bigger one. TR19 Grease cleaning restores design airflow and fan power, certificated.