Practical Home Energy Saving at shadlock.co.uk
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Updated: 17-Aug-2010
Energy Saving Light Bulb

 

Saving Electricity

Example Cost Savings - Lighting

 

Lighting

Standard light used an average of 4hrs/day on Normal Rate electricity over 2 years:

Standard 100W Bulb (replaced 3 times at 25p) costs around £27

20W Low Energy Bulb (replaced once at £2.50) costs around £8

Standard light used an average of 8hrs/day on Normal Rate plus 2hrs/day on Cheap Rate electricity over 1 year:

Standard 40W Bulb (replaced 4 times at 25p) costs around £ 16

9W Low Energy Bulb (replaced once at £2.50) costs around £6

Standard light used an average of 2hrs/day on Normal Rate electricity over 1 year:

Standard 60W Bulb (replaced once at 25p) costs around £ 5

11W Low Energy Bulb (replaced once at £2.50) costs just over £3.50

Halogen light used an average of 4 hrs/day on Normal rate electricity over 2 years.

Standard 35W Halogen Bulb (replaced once at £2) costs around £18

LED 2.8W Replacement Bulb (not replaced) costs around £8

Halogen light used an average of 4 hrs/day on Normal rate electricity over 3 years.

Standard 50W Halogen Bulb (replaced once at £2) costs around £36

LED 3.7W Replacement Bulb (not replaced) costs around £14

 

Lighting Control

2 * 150W outside lights on for 0.5hrs/day each controlled by PIR detectors with standby power of 7W each over 3 years

Powered continuously costs around £52

Powered via time switch (1W power - off for 12 hours a day) costing £8 costs around £45

 

The figures for these examples were calculated using EnCalcE , an electrical saving calculator which is free to download for personal use. Examples assume: Standard rate electricity (18hrs/day) = 11.046p/KW Hr, Cheap rate electricity (6hrs/day) = 4.975p/KW Hr (the normal rate is the lower secondary rate, both figures include VAT at 5%), No discounts are included. if you are on a single rate tariif the savings will be greater. Inflation was assumed to be 5%/year which is probably and understaement

To check your electricity bill or predict how much electricity you are likely to use try using EnCalcEU, an electricity use and cost calculator.


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