Savings
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 £0.21

Other LED benefits.
  • 10 year life expectancy.
  • No radiated heat.
  • Fully controllable.
  • Choice of colours.
  • Low voltage.
  • Energy efficient