GU10 bulb energy comparison

Comparison of halogen, CFL and LED GU10 light bulb costs

GU10 BulbsBelow is a comparison table, showing the amount of light output compared to the amount of energy used and the potential savings that could be made by changing the type of light bulb you use.

It is possible to greatly reduce your electricity costs by switching from incandescent light bulbs to more efficient energy saving types in particular the LED type which can offer an electricity cost saving of 88%. In addition to the financial benefits there are the environmental benefits of reducing green house gases due to a decrease in energy consumption.

Type of lighting

Power consumption in Watts

Light output in Lumens

Percentage power saving compared to incandescent lighting


60 watts

800 lumens



50 watts

800 lumens



14 watts

800 lumens



7 watts

800 lumens


So what does this saving equate to in monetary terms?

Lets assume that electricity costs 15 pence per kW hour.

For this example a house using 20 x 60 watt incandescent light bulbs for 4 hours a day.

The electricity cost per year would be 365 days x 4 hours a day = 1460 hours, the amount of electricity used by the bulbs is 20 x 60 watts = 1.2kW, so the total electricity used in a year is 1.2kW x 1450 hours = 1752 Kw/hours, so the cost is 1752 x 0.15 = £262.80 per year.

Below is the total cost per year for the four types of bulb,

Incandescent – £262.80

Halogen – £217.50

Compact fluorescent lamp (CFL) – £60.90

LED – £30.45

So by switching from incandescent bulbs to LED bulbs you would make a saving of £232.35 per year.

LED bulbs are more expensive to purchase than halogen, however this is quickly recouped because they have a much longer life span, up to 50,000 hours compared to 5,000 hours for a halogen bulb, so they last 10 times longer and of course there is the huge saving in electricity costs.