24V Triac Dimmable Driver

Frequently Asked Questions

What is a 24V Triac dimmable LED driver?

A 24V Triac dimmable LED driver is a constant voltage power supply that converts mains AC voltage (200–240V) to a stable 24V DC output while supporting Triac phase-cut dimming. It allows you to control the brightness of your 24V LED strip lighting using a standard wall-mounted Triac dimmer switch, delivering smooth 0–100% flicker-free dimming without the need for additional control wiring. Available from 80W up to 600W, our range covers everything from smaller residential installations to large-scale commercial and architectural projects.

What dimmer switches are compatible with a 24V Triac dimmable driver?

Our 24V Triac dimmable LED driver is compatible with both leading edge and trailing edge Triac dimmers. It works seamlessly with dimmer switches from leading brands including Lutron, Legrand, Crestron and Leviton. Key compatibility considerations include:

• Leading Edge (Forward Phase): The older, more common Triac dimming method found in many existing installations — fully supported by our drivers.
• Trailing Edge (Reverse Phase): Smoother and quieter dimming, better suited to LED loads — also fully supported.
• Load Rating: Always check that your dimmer's minimum and maximum load rating matches your driver wattage to avoid flickering or instability.
• LED-Rated Dimmers: Always use a dimmer switch specifically rated for LED loads rather than a legacy incandescent dimmer.

If you are unsure about compatibility, contact our technical team before purchasing and we will advise on the best dimmer switch for your installation.

How do I calculate the right wattage for my 24V Triac dimmable LED driver?

Selecting the correct 24V dimmable LED power supply wattage is straightforward with this calculation:

• Step 1: Find the wattage per metre of your 24V LED strip (printed on the strip or packaging, e.g. 14.4W/m)
• Step 2: Multiply by total length in metres (e.g. 10m × 14.4W/m = 144W)
• Step 3: Add a 20% safety buffer to protect longevity and ensure stable dimming performance (144W × 1.2 = 172.8W)
• Step 4: Select the next driver size up — in this example, a 200W driver

For installations with multiple strips, add all individual wattages together before applying the safety buffer. Never run a 24V Triac dimmable driver at full capacity, as this reduces lifespan and can cause unstable dimming behaviour at the lower end of the range.

Why are my LED lights flickering with a Triac dimmable driver?

Flickering with a 24V Triac dimmable LED driver is one of the most common installation issues and is almost always caused by one of the following:

• Incompatible Dimmer: The dimmer switch is not rated for LED or electronic low voltage loads — replace with an LED-compatible Triac dimmer.
• Load Below Minimum: The total LED wattage falls below the dimmer's minimum load rating, causing instability — check the dimmer's minimum load specification.
• Overloaded Driver: The combined strip wattage exceeds the driver's rated output — size up to the next wattage.
• Long Cable Runs: Excessive cable length between the dimmer and driver can introduce interference — keep cable runs as short as possible.
• Poor Connections: Loose or poorly made wiring connections can cause intermittent flickering — inspect and re-terminate all connections.

If flickering persists after checking the above, contact our technical team with details of your dimmer model, driver wattage and strip specification and we will diagnose the issue.

What is the difference between leading edge and trailing edge Triac dimming?

Understanding the difference between dimming methods is important when specifying a 24V Triac dimmable LED power supply:

• Leading Edge (Forward Phase): Cuts the front of the AC waveform. The older, more widely installed technology — found in most existing dimmer infrastructure. Can occasionally cause a slight buzz in LED drivers at lower dim levels.
• Trailing Edge (Reverse Phase): Cuts the rear of the AC waveform. Generally smoother, quieter and better suited to modern LED loads, producing less electrical noise and a cleaner dimming curve.
• Compatibility: Our 24V Triac dimmable drivers support both leading and trailing edge dimming, giving you full flexibility when working with existing installations or specifying new control systems.

For new installations, trailing edge dimmers are generally recommended for the best dimming quality with LED strip lighting.

Can I connect multiple LED strips to one 24V Triac dimmable driver?

Yes, multiple 24V LED strips can be connected to a single 24V Triac dimmable LED driver provided you follow these guidelines:

• Total Wattage: The combined wattage of all strips must not exceed 80% of the driver's rated output capacity.
• Wiring Method: Always wire strips in parallel, not in series, to ensure each strip receives the correct 24V supply.
• Balanced Distribution: For best dimming consistency, position the driver centrally and use equal-length output cables to each strip.
• Voltage Drop: For longer output cable runs, use a larger gauge cable to minimise voltage drop between the driver and the strips.
• Connection Organisation: Use a distribution block rather than splicing wires for clean, reliable and serviceable connections.

Available from 80W up to 600W, our 24V Triac dimmable driver range gives you the flexibility to power single strips or large multi-zone installations from one unit.

Is the 24V Triac dimmable driver suitable for outdoor use?

Yes. Our 24V Triac dimmable LED drivers carry an IP66 rating, making them fully suitable for outdoor installation in dry, damp and wet locations. IP66 means the housing is completely dust-tight and protected against powerful water jets from any direction, making it a reliable choice for permanent outdoor LED installations including:

• Garden and decking lighting
• Building façade and exterior architectural lighting
• Outdoor hospitality and entertainment venues
• Landscape and pathway lighting
• Pergola, gazebo and covered outdoor structures

Always ensure cable entry points and output connections are properly sealed and weatherproofed when installing outdoors to maintain the IP66 rating of the overall installation.

What protection features does the 24V Triac dimmable driver include?

Our 24V Triac dimmable LED power supply units include comprehensive built-in protection to ensure long-term safe and reliable operation:

• Overload Protection: Automatically limits output current if the connected load exceeds the rated capacity, preventing damage to the driver and strips.
• Over-Temperature Protection: Thermal shutdown activates if the driver exceeds safe operating temperature, with automatic recovery once cooled.
• Short Circuit Protection: Safely shuts down output in the event of a short circuit with automatic recovery once the fault is cleared.
• Isolated Design: Galvanic isolation between input and output provides an additional layer of electrical safety, reducing shock risk and improving system stability.

These protection features make our 24V Triac dimmable drivers suitable for professional residential, commercial and architectural installations where long-term reliability is essential.

What safety certifications do your 24V Triac dimmable drivers hold?

Our 24V Triac dimmable LED drivers carry the following certifications, ensuring full compliance with UK and European safety, performance and environmental standards:

• CE Marking: Confirms compliance with European health, safety and electromagnetic compatibility requirements.
• RoHS Compliance: Confirms the product is free from restricted hazardous substances including lead and mercury.
• REACH Compliance: Meets EU chemical safety regulations for substances of very high concern.
• IP66 Rating: Independently verified protection against dust ingress and powerful water jets, suitable for outdoor installation.

All our 24V Triac dimmable drivers come with a 3-year warranty as standard, with our UK-based technical team available to support installation queries and troubleshooting throughout.

Can a 24V Triac dimmable driver be used with 12V LED strips?

No. A 24V Triac dimmable LED driver must only be connected to 24V LED strips or 24V LED lighting products. Connecting it to a 12V strip will immediately damage the LEDs due to overvoltage and will void any warranty on both the driver and the strips. Constant voltage LED drivers do not automatically adapt their output to match the connected load. If your installation requires both 12V and 24V products, always use a dedicated driver for each voltage. If you are unsure which driver is correct for your LED strip, check the voltage marking printed on the strip backing or contact our team for advice before installation.