Average time the lamp is used per day (hours):
Number of days the lamp is on per year:
Lamp power rating (watts) (this will be on the lamp):
Cost per kilowatt (pence). This will be on your energy bill. Typically 33p per kilowatt as at April 2023.
Cost of lamp (pounds)
Lifespan of lamp (hours). You may find this on the lamp's packaging. Typical values are 1,000 hours for an incandescent bulb or 8,000 hours for a low energy bulb.
Total cost of bulbs and energy per year:£0.00£0.00

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