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Energy Calculator

Traditional Light Bulb					Energy Saving Light Bulb
Number of Lamps	Wattage	Hours on per day	Electriciy costs(£/kWh)	Running Costs (£/ year)	Wattage	Running Costs (£/ year)	Savings (£/ year)	Reduction of CO₂Emissions (Kg/year)





			Totals:
1kWh = 0.43kg of CO₂ emission The figures given are estimates only other factors must be added for example, heat replacement effect must also be calculated when converting from traditional GLS to CFL lamps.

The label below shows the classification of a lightbulb's electrical consumption relative to a standard (GLS or incandescent) light bulb that produces the same amount of brightness (lumen).

Class A & B	Energy savers fall in to these categories. They are the most efficient type of light bulb and use up to 80% less energy than standard GLS light bulbs.
Class D	Mains voltage halogen bulbs usually fall into this category.
Class E & F	Standard incandescent light bulbs are the least efficient alternatives.

A	B	C	D	E	F	G
20-50%	50-75%	75-90%	90-100%	100-110%	110-125%	>125

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