24V LED strip flickers at low brightness – power supply or dimmer first?

Lighting Installation & Troubleshooting
1

We are using a 24V LED strip with a PWM dimmer:

  • Works normally at full brightness
  • Flickers at low brightness
  • Total length about 8 m
  • Single-end power input

We already replaced the strip, but the issue remains.

Questions:

  1. Is low-brightness flicker more likely caused by the power supply or dimmer compatibility?
  2. Does single-end power input make this worse?
  3. What is the most effective first step to troubleshoot?
2

This is usually a compatibility issue between the dimmer and the power supply, not a problem with the strip itself.

Recommended order:

  1. Check the dimmer type
    Make sure it is a constant-voltage PWM dimmer that supports 24V systems.

  2. Test without the dimmer
    Connect the strip directly to the power supply.
    If there is no flicker, the dimmer is the main cause.

  3. Check power input method
    For 8 m length, dual-end power injection is more stable than single-end.

  4. Check power supply margin
    Leave 20–30% power headroom to avoid unstable operation.

Start with dimmer compatibility and power injection. This usually solves the issue quickly.

3

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