Lighting makes up 11% of the average UK household electricity consumption, so understanding the cost of light bulbs is a simple step to take.
Many of us associate wattage with the amount of light a light bulb gives out – a dimmer 25W bulb compared with a brighter 60W bulb for example – but the wattage of a light bulb actually equates to the amount of electricity it uses. Brightness is measured in lumens.
- Higher energy light bulbs, such as incandescent (up to 100W) and halogen (up to 120W), are being phased out. Making the switch from incandescent lights or halogen bulbs to LED could help you save money. Swap that for ten 18W LED light bulbs and the cost is significantly less: 18W is 0.018kW x 10 = 0.18kW, so the cost every hour is just over 9p.
As a rough guide, switching your incandescent lights or halogen bulbs to LED saves you about £1 per 10 watts per bulb per year. So if it’s a 60 watt bulb, you can save £6 a year by changing the bulb to LED.
LED lights also reduce your carbon dioxide emissions by up to 40kg a year. This is equivalent to the carbon dioxide emitted by driving your car around 145 miles.
The quickest way to start saving is just remembering to turn lights off when you don’t need them. The typical household could save almost £20 a year just by switching off the lights as you leave the room.
Be aware of how many lights you have on in a room. If you have the main light on, do you need the lamp on too?
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