COB dimming decision guide
| Method | Typical decision context | Compatibility check |
|---|---|---|
| PWM low-voltage dimming | Common for constant-voltage single-color strips | Match voltage, current capacity, PWM behavior, and control frequency |
| 0-10V or DALI control | Building-control projects where a compatible driver receives the control signal | Confirm driver input, dimming range, addressing or wiring, and controller interoperability |
| Triac or phase-cut input | Retrofit or mains-control projects using a compatible dimmable power supply | Verify the phase-cut type, minimum load, and power-supply compatibility |
| Multi-channel control | Tunable-white, RGB, or RGBW COB strips | Match channel count, common-anode arrangement where applicable, controller, and total load |
Bounded evaluation workflow
- Classify the strip as single-color, tunable-white, RGB, or RGBW and record its voltage and channel wiring.
- Select PWM, 0-10V, DALI, or Triac/phase-cut architecture from the project control brief.
- Check dimmer, power supply or driver, controller, and strip compatibility on their current technical data.
- Build one representative circuit and evaluate low-end level, flicker on camera and by observation, switching, and control response.
- Record the approved component models, settings, connected load, cable layout, and observed dimming floor.
| Commissioning check | Method | Acceptance record |
|---|---|---|
| Low-end dimming | Ramp down and hold at the project-required minimum | Record instability, dropout, flicker, and restart behavior |
| Control response | Test commands, scenes, and rapid changes | Record delay, stepping, or channel mismatch |
| Representative load | Test the intended component set and a representative connected length | Record model numbers, load, cable arrangement, and settings |
For hospitality scenes, check low-level stability and transitions. For task lighting, confirm usable adjustment without visible instability. Tunable-white, RGB, and RGBW applications need channel-aware controllers; a single-color dimmer cannot provide their full color functions.
The hero is illustrative product imagery, not evidence of dimming performance. Use the documented commissioning workflow for the selected assembly.
Common mistakes include selecting only by wattage, mixing incompatible control interfaces, ignoring minimum-load behavior, and approving a loose short strip instead of the intended system.
Use the simplest compatible architecture when local control is sufficient; use 0-10V, DALI, or a project-specified system when integration is required. The final recommendation depends on the control brief and verified component compatibility.
FAQ
Can any dimmer control a COB LED strip?
No. The dimmer and power stage must match the strip voltage, channel type, load, and selected control interface.
Why does a COB strip flicker at low output?
Possible causes include an incompatible dimmer or power supply, minimum-load behavior, PWM implementation, wiring, or settings; test the complete assembly.
Does RGBW COB use the same dimmer as single-color COB?
Usually not. RGBW needs a controller and power stage that support its channel count, wiring arrangement, voltage, and load.