Old halogen dimmers chop the AC waveform, TRIAC dimming. LED drivers need a different signal: 0-10V analogue, DALI digital, DMX for entertainment, or pulse-width modulation at the chip. Mismatched driver-dimmer pairs cause flicker, audible buzz, narrow dim range, or 'pop-on' / 'drop-out'. The compatibility matrix matters.
Four ideas to carry into the next specification conversation you have.
Standard for retrofit. Works with halogen-rated dimmers. Limited dim range (~10-100%). Buzz risk.
Industry-standard for commercial. Smooth dim to 1%. Two extra wires per fixture.
Bidirectional, addressable, scene-able. Smooth 0.1-100% dim. Best for modern commercial / hospitality.
Entertainment standard. Fast (40 ms updates). Used for colour-changing and dynamic scenes.
Each method's range, complexity, and ideal use.
| Method | Range | Best for |
|---|---|---|
| TRIAC (leading edge) | 10-100% | Retrofit residential |
| ELV (trailing edge) | 5-100% | Quiet residential |
| 0-10V analogue | 1-100% | Commercial standard |
| DALI digital | 0.1-100% | Hospitality / smart |
| DMX | 0.1-100% + RGB | Stage / dynamic |
| PWM (driver internal) | 0.1-100% | Tunable white |
| Bluetooth Casambi | 0.1-100% | Retrofit smart |
Five common problems and how to fix them.
TRIAC dimmers need a minimum load (40-60 W) to work properly. A 10 W LED can't satisfy it = flicker, buzz, or no dim. Use LED-compatible dimmers.
Five LEDs from three brands on one dimmer. Each driver responds differently to the phase-cut. Result: uneven dim curve, some flickering, some not.
Visible flicker, especially in peripheral vision. Premium drivers PWM at 4 kHz+ or use analogue dimming for flicker-free.
Casambi works with Casambi-enabled drivers only. Mixing Casambi + standard 0-10V on one room = control gap.
Emergency-fed fixtures may not dim during normal operation. Always spec a separate emergency-only driver path, with full-output emergency operation.
Our LCS controllers support DALI-2, 0-10V, Casambi, KNX, and DMX from one platform. Compatibility matrix verified for every NLC luminaire.
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