| Light bulb |
100W |
| Hours used in month |
120 |
| Kilowatts x Hours |
12 |
| Cost of electricity in pence per kWh |
10 |
| Cost (in pence) to run the Item for 1 month |
120 |
| Cost to run all such Items in house for 1-month |
£ 1.2 |
| |
|
| LED Light equivalent to 100W bulb |
18W |
| Hours used in month |
120 |
| Kilowatts x Hours |
2.1 |
| Cost of electricity in pence per kWh |
10 |
| Cost (in pence) to run the Item for 1 month |
£ 0.21 |
| |
|
| Savings over one year |
|
| |
|
| 100W light bulb plus 1 replacement |
£ 15 |
| 18W LED light no replacement as LED has 10-year life span |
£ 2.51 |
| |
|
| Savings £12.49p per year X 10 = £124.90p |
|
