LED light bulb energy calculator

How much does it cost to run an LED light bulb?

We’ve all seen the commercials about how switching to LED light bulbs can save you money in the long run. But how much does it cost to run an LED light bulb in the UK? Let’s find out.

Enter the wattage of your light bulb into the LED light bulb energy cost calculator below to find out. You’ll also need to enter how much you’re paying per kWh and how long the bulb will be on.


(Estimated Running Cost)

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How many watts does an LED light bulb use?

On average, an LED light bulb uses anywhere from 9-12 watts per hour. This is significantly less than what older bulbs use, which could be upwards of 60 watts per hour.

Are LED light bulbs expensive to run?

At the outset, LED bulbs may seem more expensive due to their higher initial cost. However, they’re significantly more efficient than incandescent bulbs, using up to 90% less energy.

This efficiency translates directly into your electricity bill. The lifetime savings from an LED bulb make its higher upfront price a wise investment for both your wallet and the planet.

LED light bulb energy consumption

LED light bulb energy cost

To understand running costs, we need to understand energy consumption. LED bulbs, with their semiconductor diodes, generate light at significantly lower wattages compared to incandescent and even CFL bulbs.

Lower wattage means significantly less energy is converted to heat, which is a primary energy drain for older bulb types.

How much does it cost to run an LED bulb for 24 hours in the UK?

cost to run an LED bulb for 24 hours

The cost of electricity is generally measured in kilowatt-hours (kWh). At present (Feb 2024), the average price per kWh is about £0.29.

Using these figures and a typical LED bulb wattage, we can give an accurate estimate of what it costs to run it for 24 hours.

For instance, if a 10-watt LED bulb consumes 0.01 kWh (10 watts/1000), you’ll multiply this by the cost per kWh (£0.29), then multiply the total by 24.

The cost to run this LED bulb for 24 hours is a mere £0.07! That’s an almost negligible amount compared to older type bulbs.

LED vs. Incandescent bulb running cost

LED vs Incandescent Energy Cost

It’s time to break down the running cost comparisons. For example, running a standard 60-watt traditional incandescent bulb for 24 hours would cost 0.060 kWh x £0.29 = £0.0174, roughly six times more than the LED in the same period!

When you compound these savings over the bulb’s lifespan, which is exponentially longer for an LED, the economic argument is clear as day.

Plus, the reduced energy consumption means a significant environmental advantage. An LED bulb’s lesser demand for electricity translates to a smaller carbon footprint, a point that resonates well with the eco-conscious consumer.

Wrapping up

The bottom line is that while LED bulbs might seem like a pricier initial purchase, their long-term benefits quickly justify the cost. The reduced energy consumption can lead to a noticeable decrease in your utility bills, offering a cost-effective and sustainable lighting solution.