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How much does it cost to have a light on for 1 hour?

Well it depend on the light.

cost to have a light on for 1 hour

The old filament (or incandescent) bulbs are relatively expensive at £0.019 for an hour and the LED comes in at £0.003 . The table below also shows halogen and compact fluorescent bulbs. All bulbs are 100W equivalents giving 1600 lumins (we also give the the CO2 Emissions in the next column), this means they give out about the same light as the old 100w filament bulb, the one you used to burn your hand on because they waste so much energy as heat.

For carbon dioxide data have a look here:- Carbon dioxide emission from burning fuels and the electricity grid

Type Power How much does it cost to run a light bulb for 1 hour? How much Carbon Dioxide (CO2) is emitted by using this electricity?
Incandescent 100W £0.019 0.04kg
Halogen 70W £0.013 0.03kg
Compact fluorescent 20W £0.004 0.01kg
LED 15W £0.003 0.01kg

Just to give you an idea of the running costs of light bulbs for a year have a look at the table below, and I'm sure you can see that a move to LED is worth while.

Annual cost of running various type of light bulbs for a set number of hours each day, all bulbs are 100W equivalents giving 1600 lumins (in brackets are the CO2 Emissions)
Type Power 6 hours 12 hours 18 hours 24 hours
Incandescent 100W £40.981
(80.4kg)
£81.962
(160.9kg)
£122.943
(241.3kg)
£163.924
(321.7kg)
Halogen 70W £28.686
(56.3kg)
£57.373
(112.6kg)
£86.061
(168.9kg)
£114.747
(225.2kg)
Compact fluorescent 20W £8.196
(16.1kg)
£16.392
(32.2kg)
£24.589
(48.3kg)
£32.785
(64.3kg)
LED 15W £6.147
(12.1kg)
£12.295
(24.1kg)
£18.442
(36.2kg)
£24.589
(48.3kg)

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