Find out how much you could save - both in money and energy - by switching to energy saving light bulbs. Just select how many bulbs you have and their average daily use.
| Conventional bulb rating | Number | Average daily usage (hours) |
| 40 Watt | | |
| 60 Watt | | |
| 100 Watt | | |
| 150 Watt | | |
Based on the entries above, by replacing these conventional bulbs with the equivalent low energy ones you could save £0 and 0kg of CO2 each year.
(Note: this calculation is made using a unit price of 10.7p per kWh and the UK national average emission of 430g CO2 per kWh. Obviously not every bulb of a particular rating will be used for the same amount of time as the others, and usage will typically change throughout the year as natural light levels change, but this calculation is meant as a rough guide to the typical ball park figures that you could potentially save.)