LED Dimming Guide: 0-10V vs TRIAC vs DALI Explained
Compare LED dimming methods: 0-10V, TRIAC, and DALI. Covers compatibility, installation, cost, flicker-free dimming, and which system works best for commercial spaces.
Dimming LED fixtures saves energy, extends lifespan, and improves occupant comfort. But not all dimming methods work the same way, and using the wrong dimmer causes flickering, buzzing, or premature failure.
Three Main Dimming Methods
1. 0-10V Dimming (Most Common Commercial)
How it works: A low-voltage control signal (0-10V DC) tells the LED driver how bright to be. 10V = full brightness, 0V = minimum (typically 10%).| Pros | Cons |
|---|---|
| Industry standard for commercial | Requires extra control wires (2 wires) |
| Smooth, flicker-free dimming | Minimum dim level typically 10% (not 0%) |
| Compatible with building automation | One-way communication only |
| Simple, reliable, inexpensive |
2. TRIAC Dimming (Phase-Cut)
How it works: The dimmer switch chops the AC power waveform to reduce power to the fixture. Same technology as traditional incandescent dimmers.| Pros | Cons |
|---|---|
| Works with standard wall dimmers | Can cause flickering with incompatible LEDs |
| No extra wiring needed | Limited to shorter runs |
| Familiar to residential electricians | Buzz/hum from some dimmers |
| Lower cost per circuit | Not recommended above 200W total |
3. DALI (Digital Addressable Lighting Interface)
How it works: Digital communication protocol where each fixture has a unique address. A DALI controller sends commands over a 2-wire bus.| Pros | Cons |
|---|---|
| Individual fixture control | Higher cost per fixture and controller |
| Bi-directional communication | Requires DALI-compatible drivers |
| Scene programming | More complex commissioning |
| Monitoring and diagnostics | Overkill for simple applications |
| Group and zone control |
Which Dimming Method to Choose
| Application | Recommended | Why |
|---|---|---|
| Warehouse with sensors | 0-10V | Simple, reliable, motion sensor compatible |
| Open office | 0-10V or DALI | Daylight harvesting, zone control |
| Conference room | TRIAC | Wall dimmer convenience |
| Restaurant | TRIAC | Ambiance control, simple |
| Parking garage | 0-10V | Motion sensor integration |
| Hospital | DALI | Individual room control, monitoring |
| Retail store | TRIAC or 0-10V | Scene setting, display highlighting |
Motion Sensor + Dimming: Maximum Savings
The most cost-effective dimming strategy for commercial spaces:
Auvolar's High Bay Motion Sensor ($29, SKU: SENS-HB-MS) works with any 0-10V dimmable fixture. Typical ROI: 3-6 months.
Avoiding Dimming Problems
All Auvolar commercial fixtures specify dimming compatibility in the product datasheet. Contact us for dimming compatibility questions.
Need Help With Your Lighting Project?
Auvolar provides free lighting design, photometric layouts, and rebate assistance for commercial projects.