Smart bulbs are one of the cheapest ways to make a UK home feel genuinely modern. However, most reviews stop at the purchase price. They rarely tell you what a bulb costs to run once it is screwed in, paired and left drawing power for 8,760 hours a year.
This guide calculates the real smart bulb running cost UK households face in 2026. We compare ten bulbs from Philips Hue, IKEA TRÅDFRI and TP-Link Tapo, including the standby draw from bridges and hubs that almost every other comparison quietly ignores.
What the Smart Bulb Running Cost UK Really Looks Like in 2026
Ofgem’s price cap for Q4 2026 sets electricity at roughly 26.4p per kWh for a typical dual-fuel household paying by direct debit. The daily standing charge sits close to 63p. You can check the current figures on the Ofgem price cap page.
That standing charge matters. At 63p a day, every home pays about £230 a year before a single light is switched on. Therefore, our calculations only count the unit rate — the part your bulbs actually influence.
The assumptions behind our numbers
- Ten E27 smart bulbs in one household
- Three hours of use per bulb per day — 1,095 hours a year
- Full rated brightness, so this is a worst-case figure
- Electricity at 26.4p per kWh
- Standby measured with the wall switch on but the bulb off in the app
- Manufacturer power ratings, checked in September 2026
Real households dim their lights, so most will land 20 to 30% below these totals. Furthermore, few rooms are lit at full output all evening.
Philips Hue vs IKEA TRÅDFRI vs TP-Link Tapo: The Hardware
Philips Hue: premium bulbs, permanent bridge
Philips Hue remains the premium choice. The White and Colour Ambiance A60 pulls 9W at full brightness and produces around 1,100 lumens. Every Hue bulb also needs the Zigbee mesh, so the Hue Bridge is effectively mandatory at £54