In 2012 an 11-watt LED bulb, which could replace a 60-watt bulb, cost a whopping £45. Today a 6W LED bulb, which is equivalent of a standard 60W light bulb, costs about £4,50.
But is it worth spending £4,50 on a light bulb? It’s quite easy to calculate.
Say you want to change the kitchen light bulb, where you have a standard 60W light bulb today. You keep the kitchen light on about 2 hours in the morning, and about 4-6 hours in the evening, let’s say an average of 7 hours every day of the year. That equals 60W times 7 hours = 420Watt hours per day. Multiplied by 365 days, you see that your kitchen light uses about 153,300Watt hours per year, or 153KiloWatt hours. If the cost of electricity from your supplier is 12 pence per KiloWatt hour (kWh), your kitchen light costs £18,3 per year.
Now let’s say that you decide to buy the £4,50 LED bulb that uses 6Watt instead of 60. If you still have the light on an average of 7 hours per day, you will use 15,330Watt hours in a year, or 15,3 KiloWatt hours. This equals £1,8 on your electricity bill per year. In only one year you have already paid back the cost of the bulb, and you are saving money every year.
If you have 10 light bulbs at home similar to the 60Watt one in the kitchen, this would amount to £183 on your electricity bill every year, compared to ten 6Watt LED bulbs that cost £18 per year.
You could use the saving of £165 every year on a dinner at one of your favorite restaurants, celebrating what a great decision you have made.
You are also doing the environment a great favor by reducing your carbon footprint.