Calculator/Comparator

This page allows you to calculate and compare the cost, both economically and environmentally, of your outdoor lighting.

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Input parameters

Select a typical setting:
Or type in your own values...
Number of lights:
Number of hours your lights are on per day:
Cost of electricity (pence per kW hr):
Bulb power rating (Watts):



Output parameters

» Energy used per year (kWh):

» Energy used per week (kWh):

» Cost per year (£):

» CO2 pollution generated per year (kg):
(We use DEFRA's average figure of 0.43 kg of CO2 per kWh in the UK; This is a mix of coal, gas, nuclear and renewables. e.g. Coal power stations produce 0.9kg/kWh, renewables produce no CO2 emission)

Comparisons

» Equivalent minimum number of energy efficient bulbs:
(most applications, both business and at home, require a maximum of a 50W bulb, if not less e.g. The Glarebuster)

» Equivalent CO2 pollution in car miles travelled:
(assuming 150g CO2 is produced per km; ref. Society of Motor Manufacturers and Traders Limited)

» Equivalent CO2 pollution in aircraft miles:
(assuming 170g CO2 per km; ref. BBC News)

» Equivalent hours a television is used per week:
(assuming a 100W TV)

» Equivalent number of televisions on standby all week:
(if a TV uses 10W when in standby, it will use 1.68kWhr per week)

» Equivalent hours a desktop PC is on per week:
(assuming a desktop PC uses 100W, and its monitor uses 100W)

» Equivalent energy usage in cups of tea/coffee per day:
(assuming a 3000W kettle boils 1.5 litres of water for 6 cups of tea in 3 minutes)

» Equivalent number of washing machine cycles per week:
(assuming a washing machine uses 1.15kWh per cycle)

» Equivalent number of tumble drying cycles per week:
(assuming a dryer uses 4.5kWh per cycle)

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