What Is DALI Lighting?
DALI (Digital Addressable Lighting Interface) is the leading standard for intelligent lighting control in commercial buildings, offices, hospitality venues, and high-end residential projects. This guide explains how it works, how to wire it, and whether it is right for your project.
How Does a DALI System Work?
Unlike a conventional dimmer switch that controls all lights on a circuit simultaneously, a DALI system allows each driver — and therefore each light or group of lights — to be addressed individually. You can dim, switch, or set scenes for any combination of lights from a single controller.
A DALI system has four core components:
Each DALI driver is assigned a unique address (0–63 per bus — up to 64 devices per network). Up to 16 groups and 16 scenes can be programmed on a standard DALI network.
How to Wire a DALI System
DALI is a wired protocol. The bus uses a non-polarised two-wire cable running in parallel alongside the mains supply to each driver.
- The DALI bus operates at 16V DC — use standard two-core cable (1.0mm² or 1.5mm² is sufficient for most installations)
- Maximum bus cable length: 300 metres total in a single system
- The bus is non-polarised — polarity does not matter
- Each driver connects to both the mains supply (for power) and the DALI bus (for control) — two separate connections on the driver
- DALI does not require a star topology — you can wire in a line, loop, or tree structure
Do not run DALI bus cable in the same conduit as mains cables — this can cause interference.
What Is DALI Dimming?
DALI dimming is digital dimming. Rather than reducing voltage or cutting the power cycle as a conventional dimmer does, DALI sends digital commands directly to the driver. This gives several advantages over conventional dimming:
- Smooth, flicker-free dimming from 100% down to 0.1%
- Logarithmic dimming curve — matches how the human eye perceives brightness for a natural fade
- Individual control of each driver — dim one section while leaving another at full brightness
- Scene recall — programme and recall lighting states instantly
- Feedback — DALI drivers can report status back to the controller, enabling fault detection
Is DALI Worth It for My Project?
DALI makes most sense for commercial and larger projects where individual control, scene programming, occupancy integration, or BMS compatibility is needed. For a single-room residential installation, a simpler RF or Bluetooth dimmer is usually more appropriate.
DALI drivers will typically operate at full brightness without a DALI controller connected — so if the controller fails, the lights stay on. This makes DALI fail-safe for commercial environments.
DALI is well suited for:
- Open-plan offices with zone control and occupancy sensors
- Hospitality — hotel corridors, restaurant dining areas, conference rooms
- Retail — accent lighting with scene changes throughout the trading day
- High-end residential — multi-room systems with scene setting
- Projects requiring BMS integration or energy monitoring
What Are the Alternatives to DALI?
| Protocol | Best for |
|---|---|
| 0–10V dimming | Analogue dimming, simpler to install but no individual addressing |
| PWM dimming | Pulse-width modulation, common in residential LED dimmer setups |
| Casambi / Bluetooth mesh | Wireless, good for retrofit and residential with no bus wiring required |
| DMX | Typically used in entertainment and architectural feature lighting |
Related guides
What driver do I need? → LED strip voltage explained → Complete guide to LED strips → COB vs SMD →Need help specifying a DALI system?
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