If you replace a traditional light bulb with a compact fluorescent bulb of the same brightness you will typically save around £3 per year, or £55 over the life of the bulb.
If you replace a 50W halogen downlighter with a 6W LED you will typically save around £4 per year, or £70 by the time you have to replace the bulb.
Many homes today use a mixture of standard light fittings and halogen downlighters or spotlights (mainly in kitchens and bathrooms). There are low-energy alternatives for both these types of light:
Of course, the easiest way to save on your lighting bill is simply to turn off the light when you’re not using it. You will always save energy if you turn the light out when you leave the room, even if it’s only for a minute or two.