Energy-efficient lighting helps lower electricity bills and carbon dioxide emissions, all without reducing the quality of light in our homes. If you replace all the bulbs in your home with LED lights, you could reduce your annual carbon dioxide emissions by up to 35kg in Great Britain (GB) and 35kg in Northern Ireland (NI). Lighting makes up 11% of the average UK household electricity consumption, so making the switch could help you save money too.

Traditional or incandescent light bulbs were invented more than 100 years ago and are extremely inefficient. Only about 5% of the electricity they use converts into visible light. Moreover, the bulbs don’t last long because the filament that creates the light evaporates as heat passes through it.

Halogen light bulbs use the same filament technology as traditional bulbs but run at a higher temperature, making them slightly more efficient. They are mainly used in spotlight fittings. Traditional incandescent and the least efficient halogen light bulbs are being taken off the market in favour of energy-efficient alternatives. Instead of these energy-inefficient designs, we can use modern replacements to provide the same amount of light but for less electricity.

Compact fluorescent lamps (CFLs) were the first energy-efficient bulbs on the market and use around 70-80% less electricity than the equivalent traditional bulbs, as well as lasting almost 10 times longer. CFL bulbs have a gas inside a glass tube that is charged with electricity until it glows.

Light emitting diodes (LEDs) have largely replaced CFLs, which are more efficient still, turn on instantly at full brightness, and are available to fit pretty much any light fitting in the home. LEDs produce light from the electricity flowing through them. Within a bulb, you will find many LEDs to create sufficient brightness.

Switching halogen bulbs to LEDs

50 watt halogen bulb
Save up to £4 per bulb per year
(Based on 750-lumen bulb running for 521 hours per year.)

35 watt halogen bulb
Save up to £3 per bulb per year
(Based on an 525-lumen bulb running for 521 hours per year.)