What LED Driver Do I Need for 24V LED Strip Lights?

Key Takeaways:

• A 24V LED strip requires a matching 24V constant voltage LED driver.
• Calculate total strip wattage, then choose a driver with spare capacity.
• Dimming requires compatible drivers, switches and LED strip controls.
• Outdoor or damp installations need suitably protected LED drivers.
• Correct driver sizing helps prevent flickering, overheating and early failure.
• Planning wattage, controls and location first makes driver selection easier.

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How to Choose the Right 24V LED Driver

If you are planning a 24V LED strip lighting installation, choosing the correct LED driver is one of the most important decisions you will make. Get it right and your lighting setup will perform reliably for years. Get it wrong and you risk flickering, overheating, or strips that simply do not work.

This guide answers one practical question: which 24V LED driver do I need, and how do I work it out? Whether you are fitting a few metres of kitchen tape or planning a larger project with outdoor LED strip lights, the calculation process is the same.

The right LED driver depends on five things:

1. The voltage of your LED strip (in this case, 24V)
2. The wattage per metre of the strip
3. The total length of LED strip being installed
4. Whether you need dimming or control
5. Where the driver will be installed

What Does an LED Driver Do?

An LED driver converts mains electricity (230V AC in the UK) into the low-voltage DC power that LED strip lighting requires. Without a driver, your strips cannot run safely from a standard mains supply.

For 24V LED strip lights, you need a 24V constant voltage LED driver. The driver must match the strip voltage exactly, and it must supply enough wattage to power the full length of strip you are installing. Choosing the wrong driver is one of the most common causes of poor performance, flickering, and premature failure.

How to Calculate the LED Driver Size You Need

This is the core calculation every LED strip installation requires. The formula is straightforward: LED strip wattage per metre x total metres = total wattage required

Once you have that figure, choose a 24V LED driver rated above it, not one that matches it exactly. Running a driver at its maximum load continuously reduces reliability and shortens its lifespan.

Step-by-Step Calculation

1. Find the wattage per metre on the LED strip product page or packaging
2. Measure the total length of LED strip lighting you are installing
3. Multiply watts per metre by total metres
4. Add a safety margin by selecting the next driver size above your total

Worked Examples

Installation	Watts per Metre	Total Length	Wattage Required	Driver to Choose
Under-cabinet lighting	10W	3m	30W	24V driver rated above 30W
Living room feature wall	10W	5m	50W	24V driver rated above 50W
Larger project	10W	10m	100W	24V driver rated above 100W

The exact wattage per metre will vary depending on the specific LED strip product you are using. Always check the product specification before purchasing your driver.

Do You Need a Dimmable LED Driver?

Not every LED driver supports dimming, so it is important to decide whether you need dimming capability before you buy.

If you want to control the brightness of your 24V LED strip lights, you have two options:

• Dimmable LED driver with a compatible dimmable switch: The driver itself supports dimming and is wired to a compatible wall dimmer or inline dimmer switch. The dimmable switch and driver must be specified to work together.
• Non-dimmable driver with a separate controller: For RGB or RGBW LED strip lighting, you will typically use a standard driver alongside a dedicated controller. The controller handles the colour and brightness adjustment.

The key rule: a standard non-dimmable driver will not work reliably with a dimmable switch. Always confirm that your driver, switch, and LED strip are all compatible before committing to a lighting setup.

Indoor vs Outdoor LED Drivers

Where you install the driver matters just as much as the wattage. For more complex projects, our lighting design services can help you plan the full lighting setup before you buy components. Indoor drivers are suitable for dry internal spaces such as under kitchen cabinets, inside wardrobes, or within ceiling voids.

For outdoor LED strip lights or installations in damp locations, the driver must be suitably rated for that environment or housed in a weatherproof enclosure. The IP rating of the LED strip and the suitability of the driver are separate considerations; a waterproof strip does not automatically mean your driver is protected.

Always install the driver in an accessible location so it can be maintained or replaced if needed.

Common Mistakes When Choosing a 24V LED Driver

Even experienced installers make these errors. Avoid them before you buy:

• Using a 12V driver with 24V LED strip lights (the voltage must match)
• Matching the driver wattage exactly to the strip with no extra capacity
• Forgetting to add together the wattage of multiple LED strip runs
• Ignoring the wattage per metre of the specific product being used
• Pairing a non-dimmable driver with a dimmable switch
• Installing the driver in an unsuitable or inaccessible location
• Overlooking voltage drop on longer LED strip runs
• Buying the LED strip before planning the driver and cable layout

24V LED Driver Buying Checklist

Before purchasing your LED driver, work through this checklist:

• Is your LED strip definitely 24V?
• What is the wattage per metre of the strip?
• How many metres of LED strip lighting are you installing?
• What is the total wattage required?
• Have you allowed extra driver capacity above that figure?
• Are you powering one strip run or multiple runs?
• Do you need a dimmable LED driver?
• Do you need RGB or RGBW control?
• Will the driver be installed indoors or in an outdoor or damp location?
• Is the driver location accessible for maintenance?

Need Help from a Lighting Specialist?

If you know the length and wattage of your 24V LED strip lights but are not sure which driver to select, our team at ORKO Lighting can help. As a UK lighting specialist, we work with homeowners and trade professionals on projects of all sizes, from a single under-cabinet run to full commercial lighting setups.

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FAQs

How do I know what LED driver I need for my LED strip?

Check the strip voltage, wattage per metre and total length. For a 24V strip, use a 24V constant voltage driver with enough capacity for the total calculated wattage.

How many metres of LED strip can one driver power?

It depends on the strip's wattage per metre and the driver's rated output. Multiply watts per metre by the number of metres to determine the total power required.

What happens if my LED driver wattage is too low?

An undersized driver may cause unreliable performance, including flickering, overheating or failure to operate correctly. The driver should be rated above the total wattage required.

Can an LED driver be too powerful for an LED strip?

A 24V constant voltage driver can have a higher wattage capacity than the strip requires. The key is matching the 24V output and ensuring sufficient wattage capacity.

Do I need one LED driver for each LED strip?

Not necessarily. One suitably sized 24V driver can power multiple compatible LED strip runs if their combined wattage remains within the driver's capacity.