Energy Cost
Calculator
See how much you could save by switching to LED lighting.
Compare your existing lighting with energy-efficient LED alternatives and see your estimated running costs and yearly savings.
Lighting can make a big difference to the comfort of your home or business, but older bulbs can use more electricity than needed. Use our simple energy calculator to compare your current lighting with modern LED alternatives and see your estimated running costs, savings and payback time.
Calculate your lighting running costs
Enter your current bulb wattage, LED replacement wattage, number of lights and daily usage. The calculator will estimate your current yearly cost, new LED running cost and potential savings.
Lighting Energy Cost Calculator
Estimate running costs and compare potential savings when switching to LED lighting.
Figures are estimates only. Actual energy usage and cost may vary depending on the electricity supplier, tariff, installation and product specification.
Important note:
This calculator provides an estimate only. Actual costs may vary depending on your electricity supplier, unit rate, daily usage and the type of lighting installed.
Why switch to LED lighting?
LED lighting is one of the easiest ways to reduce electricity usage without compromising on brightness or style. Whether you are replacing bulbs in a home, showroom, office, garden or commercial space, LED options can help lower running costs while providing reliable everyday performance.
Lower Energy Use
LED bulbs use less electricity while still providing bright, reliable light for everyday use.
Longer Lifespan
Quality LED bulbs last longer, helping reduce replacement costs and ongoing maintenance.
Better Light Choices
Choose from warm white, cool white, dimmable, vintage and decorative LED options.
Suitable for Many Areas
Ideal for homes, gardens, showrooms, offices, displays and commercial lighting areas.
Watts vs Lumens: what should you look for?
Many people still choose bulbs by wattage, but wattage only tells you how much power a bulb uses. Brightness is measured in lumens. When replacing older bulbs, it is better to compare the lumen output so you get the right level of brightness while using less energy.
| Brightness | Old Incandescent | Halogen | CFL | LED |
|---|---|---|---|---|
| 470 lumens | 40W | 29W | 9W | 4W |
| 806 lumens | 60W | 42W | 14W | 7W |
| 1521 lumens | 100W | 72W | 23W | 10W |
| GU10 spotlight | 50W | 50W | - | 5W |
Figures are approximate and may vary depending on the specific bulb, brand, light output and fitting type.
Best LED Bulbs to Consider
LED bulbs are available in a wide range of cap types, wattages, colour temperatures and styles. Browse a small selection of popular LED bulbs below, or view our full LED bulb range to find the right option for your fitting.
4W Candle LED Light Bulb Non Dimmable
Original price was: €8.50.€7.65Current price is: €7.65.
6W E27 LED Light Bulb Dimmable
Original price was: €13.95.€12.55Current price is: €12.55.
2.6W G9 Non Dimmable LED Light Bulb
Original price was: €8.95.€8.05Current price is: €8.05.
5W LED GU10 3000K Non-Dimmable Light Bulb
Original price was: €9.95.€8.95Current price is: €8.95.
LED 4W Vintage Light Bulb Non Dimmable
Original price was: €16.95.€15.25Current price is: €15.25.
6W E27 RGB+CCT LED Light Bulb
Original price was: €35.00.€31.50Current price is: €31.50.
LED 4W RGB+CCT MR16 Light Bulb
Original price was: €35.00.€31.50Current price is: €31.50.
6.5W B22 Clear LED Bulb 2700K Non Dimmable
Original price was: €7.45.€6.70Current price is: €6.70.Need Help Choosing the Right LED Bulb?
Not sure which wattage, cap type, colour temperature or dimmable option you need? Our lighting team can help you choose the right LED bulb or fitting for your home, garden or business.
Bulb Type
Get help choosing the correct cap type, wattage and fitting style.
Light Colour
Find the right warm white, cool white or decorative lighting tone.
Room Advice
Choose suitable LED bulbs for homes, gardens and commercial spaces.
Energy Calculator FAQs
Find quick answers about lighting running costs, LED savings, bulb wattage and choosing the right energy-efficient lighting.
How do I calculate the cost of running a light bulb?
To calculate the running cost, multiply the bulb wattage by the number of hours used, convert watts to kilowatts and multiply by your electricity unit rate. Our calculator does this automatically and shows estimated running costs and savings.
Are LED bulbs cheaper to run?
Yes, LED bulbs usually use much less electricity than older incandescent or halogen bulbs. This can help reduce your energy costs, especially when lights are used for long hours or across multiple rooms.
What is the difference between watts and lumens?
Watts measure how much electricity a bulb uses, while lumens measure brightness. When replacing an older bulb, compare lumens to make sure you get the right brightness while using less energy.
What electricity rate should I enter?
Use the unit rate shown on your electricity bill. This is usually listed as a cent per kWh rate. If you are not sure, you can enter an approximate rate and update it later for a more accurate estimate.
Can I use the calculator for commercial lighting?
Yes, the calculator can be used for homes, shops, offices, showrooms, displays and other commercial spaces. Enter the number of lights and daily usage hours to estimate your lighting running costs.
Will changing to LED bulbs reduce my electricity bill?
Switching to LED bulbs can reduce the electricity used by your lighting. The actual saving depends on your current bulbs, how many lights you replace, how long they are used and your electricity unit rate.