LED lighting is increasingly popular for everything from homes and offices to hospitality and events. Besides their energy-saving properties, attractive aesthetics and long lifespan, LEDs can also be dimmed—giving you precise control over brightness for different effects throughout the day. So, how does LED dimming work, and what should you consider when choosing a dimmable LED power supply?

This guide explains what a dimmable LED power supply is, how to choose the right one, and showcases some of the best dimmable options stocked at WeLoveLEDs.

What is a dimmable LED power supply?

A dimmable LED power supply lets you adjust the brightness of your LEDs. The main dimming types include:

  • Resistive dimming: Uses a potentiometer to vary resistance and change light level.
  • 0-10V or 1-10VDC dimming: A control voltage signal (0-10V) alters brightness; 1V equals 10% output.
  • PWM (pulse-width modulation): An external circuit adjusts the average voltage to the dimming input.

Many dimmable power supplies now feature three-in-one dimming, combining all these options in a single unit.

TRIAC dimming is especially popular in commercial settings. It uses a three-terminal device (TRIAC) connected to the mains, functioning as a dimmer switch and adjusting the current delivered to your LEDs. This is ideal for creating the right mood in bars, restaurants and event venues.

DALI (Digital Addressable Lighting Interface) power supplies use a two-way digital protocol to control multiple LED drivers and bulbs on a single network. This is most useful in larger buildings or when you need centralised control across zones or rooms.

How to choose the right dimmable power supply for your LEDs

  • Size: Make sure the power supply fits the installation space.
  • Voltage: Match the supply voltage to your LEDs—e.g., 24V strip to 24V PSU.
  • Maximum wattage: Add up the total wattage of your lights and choose a PSU with some headroom. Exceeding the limit can cause failure and fire risk.
  • Application environment: Check IP ratings for moisture or outdoor use (IP66 or above for wet environments).

Dimmable LED power supplies from WeLoveLEDs

  • 200W 24V PSU Dimmable: 100-265VAC input, convection cooled, and robust output (8.33A). Suitable for a wide range of LED and moving sign applications.
  • 200W 12V PSU TRIAC Dimmable: Constant voltage TRIAC unit with three-in-one dimming, 180-240VAC input, IP66, and high reliability—ideal for lighting and signage.
  • 180W 12V PSU Dimmable: IP66, convection cooled, high current (15A), and solid build for continuous use.
  • 100W 24V PSU DALI Dimmable: Built-in DALI interface, 0.1%–100% dimming, IP66, and multiple protections for large or networked installations.

See our full range of dimmable LED power supplies here.

Frequently asked questions

How does an LED driver differ from a typical power supply?
They’re the same thing—just two names for the same product.

Does dimming save electricity?
Yes. Dimming at the mains will save energy, though the amount saved is relatively modest. Low voltage side dimming saves a little less, but both are still energy efficient options.

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