Do LED Bulbs Save Money? The True Cost of Running Your Lights

Finding your electricity bills soaring? You’re not imagining it. One of the easiest ways to cut your usage is by changing your light bulbs. But do LED bulbs really save money, or is it just another energy-saving myth?

Let’s look at how much an LED bulb costs to run and whether switching actually makes a difference to your electricity bill.

Quick answer: Do LED bulbs save money?

Yes. Switching from traditional or halogen bulbs to LED can cut lighting costs by up to 90%. Even with today’s higher electricity prices, most LED bulbs pay for themselves within a few months and then keep saving you money every year they’re in use.

How much does an LED bulb cost to run?

Used for around four hours a day, most LED bulbs cost between 3p and 8p per week to run. Over a full year, that’s roughly £1.50 to £4.40 per bulb.

To put that into context, a traditional 60w incandescent bulb costs over £26 per year to run.

Electricity prices change regularly, so the figures below are based on a realistic average unit rate of 30p per kWh. If your tariff is higher, your savings from switching to LED will be even bigger.

LED bulb running costs compared

LED bulb money saving

When I was younger, I remember the old incandescent bulbs. The ones that ran so hot they could probably have cooked breakfast. Touch one by mistake and you’d know about it instantly.

That heat wasn’t accidental. Incandescent bulbs waste most of their energy as heat, which is why they’re expensive to run.

Then came “energy-saving” bulbs, also known as compact fluorescent lightbulbs. You’d flick the switch, wait, flick it again, and then stand there wondering if it was ever going to turn on properly. Fifteen minutes later, the room would finally brighten.

They also contain mercury, which means they shouldn’t be thrown in the bin. Unfortunately, many still are.

Also worth reading

Looking to save money? See if it’s cheaper to use candles or LED bulbs.

What is an LED bulb?

LED stands for Light Emitting Diode. Instead of heating a filament or using mercury vapour, LEDs use a semiconductor that emits light when electricity passes through it.

The reason LEDs are so efficient is simple: they produce very little heat.

Traditional incandescent bulbs convert less than 5% of their energy into light. The rest is wasted. LEDs flip that completely, which is why they stay cool and cost so little to run.

You can even touch an LED bulb after it’s been on without losing skin, which is ideal if, like me, you have a child who seems strangely attracted to light fittings.

Why LED bulbs use so much less electricity

Brightness is measured in lumens, not watts.

A traditional 40w bulb produces around 450 lumens. A 60w bulb produces about 800 lumens. An LED bulb producing the same brightness typically uses between 4 and 10 watts.

So if you had ten 40w bulbs switched on at once, you’d be using 400 watts of electricity. The LED equivalent would use around 40 watts. That’s a 90% reduction for the same amount of light.

LEDs also last far longer. A typical incandescent bulb lasts 1,000 to 2,000 hours. LEDs are rated for 25,000 to 50,000 hours, depending on quality. That’s at least 15 times longer.

The disadvantages of LED bulbs

They do cost more upfront, although prices have fallen dramatically. In reality, the lower running costs mean they usually pay for themselves very quickly.

Light colour can vary. Some LEDs produce a colder, blue-tinted light. Look for “warm white” (around 2700K) for living rooms and bedrooms, and try to stick to one brand in the same room to avoid mismatched colours.

If you have dimmer switches, make sure you buy dimmable LEDs. Non-dimmable bulbs will flicker or fail.

Is it worth replacing halogen bulbs with LED?

Absolutely.

Halogen downlights are especially expensive to run. When I moved into my house, the front room had 20 halogen bulbs on one circuit. Together, they used 700 watts. Turning them all on felt like operating floodlights.

After switching them all to LED, the same room now uses around 50 watts. That’s less electricity than two of the original bulbs.

Swapping halogens isn’t always as simple as bayonet or screw fittings. Peg-style bulbs are easy. Pin fittings take longer, but they’re still manageable if you’re confident with basic DIY.

I replaced around 30 halogen bulbs across my house. It took a few hours, but the savings were immediate.

The cost of not switching

The real cost isn’t buying LED bulbs. It’s continuing to run outdated ones.

A single 60w bulb costs over £26 per year to run. Leave ten of them in place and you’re spending close to £200 a year just on lighting. Over five years, that’s nearly £1,000 that LEDs could have saved.

Yes, you will need to factor in the cost of new bulbs, but you can buy ten from places like Amazon for less than £20.

How to calculate the cost of running an LED bulb yourself

If you want exact figures for your home, use this simple formula:

Wattage ÷ 1000 × hours used × electricity unit rate

For example, a 5w LED used for four hours a day at 30p per kWh costs around 0.6p per day. Multiply that by 365 and you’ll see why LED lighting is so cheap to run.

Best tips when buying LED bulbs

Don’t focus on watts. Look at lumens.
Choose warm white for living rooms and bedrooms.
Stick to one brand per room to avoid colour differences.
Double-check fittings, especially for downlights.
Only buy dimmable LEDs if you have dimmer switches.

Cheap LEDs are fine for most rooms, but spending a little more on frequently used lights usually gives better colour and longevity.

Are LED bulbs better for the environment?

Yes, without trying too hard.

LEDs use far less electricity, which reduces demand on the grid and cuts carbon emissions. Their long lifespan also means fewer bulbs are made and thrown away. It’s one of the rare changes that saves money and helps the environment without any lifestyle sacrifice.

So, do LED bulbs really save money?

Definitely.

LED bulbs cost pennies to run, last for years, and slash lighting costs almost overnight. Even replacing just your most-used bulbs will make a noticeable difference.

Switch the rest as old ones fail, and within a year or two your lighting costs will be a fraction of what they used to be.

Further reading

And if my how much do LED bulbs save post has interested you, why not find out more about cutting your heating bills?

FAQs