Can I really save money?

A standard LED light bulb will cost you between £5 and £10, and consumes just 10% of the energy that’s gobbled up by old‑style incandescent light bulbs. In contrast, the app-controlled smart bulbs we look at here cost more – from £30 to £60 – so it’s probably best to start with two or three bulbs (often available in a starter kit) so that you can control the lights in your lounge or main bedroom.