How to calculate £ and energy saved per year when swapping to LED

 

 

Life span = 50,000 hours

A = Current light bulb wattage

B = New LED light bulb wattage

 

Hour’s                    days

Switched on            per year

Per day                   used

A – B  x  12  x  365  ÷  1000 x £0.10 per kilowatt hour=£ saved

 

  • £ per kilowatt hour will change depending on electrical supplier!
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