Buyer information, not installation instructions. Requirements depend on the adopted local code and exact product. Electrical work and site diagnosis should be performed by qualified professionals.
LED flicker on a dimmer can come from a lamp that is not dimmable, an incompatible control, or a light level below the lamp’s stable range. Note when it happens: at startup, near minimum brightness, or throughout the range. [Source]
“Four lamps flicker near the bottom of the slider and stay steady at full brightness” gives a useful starting point. Record what you can observe without opening the wall box.
Compare the lamp and dimmer specifications
Check the lamp or driver’s full model number, dimmable marking and required control method. A 0-10V driver needs a compatible 0-10V control.
In our range, DM2010 is listed for dimmable LED/CFL loads at 120V AC, 60Hz. DM2010S is the separate 0-10V model, with a 120/277V supply specification. Keep the S suffix when comparing them. [Source]
DM2010’s published LED/CFL range is 5 to 200W; its incandescent range is 20 to 600W. Use the LED range for LED lamps. Four 10W lamps total 40W, but that calculation still needs a compatibility check with the actual lamp model. [Source]
When flicker appears only at low brightness
Lutron explains that some LEDs reach their lowest stable light level before the dimmer reaches its minimum setting. Supported dimmers may offer a low-end adjustment. The setting and procedure belong to the exact control; Maestro instructions should not be applied to DM2010. [Source]
During sample review, agree on the lowest light level the room needs and demonstrate it with the planned lamp quantity. For several devices mounted together, request the applicable load limits. The current FAHINT catalog sheet has no multi-gang derating schedule.
Send the details that help identify the problem
- Dimmer model and the lamp or driver manufacturer and model.
- Lamp quantity, wattage per lamp and the specified dimming method.
- Whether the symptom occurs at startup, at low brightness or throughout the range.
- Whether every lamp behaves the same way, and whether anything was recently changed.
Describe what you see in person as well as sending a short video. Stop using a control with heat damage, a burning smell or arcing and arrange qualified inspection. Electrical faults and wiring checks need an electrician.
For a new installation, keep the accepted lamp and dimmer models together in the sample record. Recheck compatibility if the lamp or driver changes.
Four causes we look at before calling it a dimmer fault
- Is the lamp or driver actually rated as dimmable? A non-dimmable driver flickers at every level, not just low ones.
- Is the connected load above the dimmer's minimum? A single 6 W lamp is sometimes below the threshold where the circuit behaves.
- Is the dimmer a 0–10 V model on a driver without a 0–10 V input? DM2010S cannot dim a driver that was never built to accept the signal.
- Are mixed lamp types sharing one dimmer? Two technologies on one control rarely track each other across the range.
The pattern narrows it quickly. Flicker only at the bottom of the travel points at load or driver behaviour. Flicker at every level, including full on, points at the driver or the supply. A buzz that appears with one particular lamp and disappears with another is usually the lamp, not the control.
A photograph of a flickering lamp cannot diagnose anything, and neither can one of the dimmer. What does help is a short video taken at constant camera settings, plus the lamp model, the driver model, the number of drivers on the dimmer, the total connected load and the exact model number of the control. With those five, the answer is usually one exchange.
Sources & further reading
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