KNX + DALI Lighting Control
How KNX and the DALI lighting bus work together through a gateway, and when DALI is the right choice for professional lighting.
KNX is the building-wide automation bus; DALI (Digital Addressable Lighting Interface) is the international standard for digital lighting control. They are complementary, not competitors: a KNX-DALI gateway lets KNX command individually addressable luminaires, while DALI handles the fine-grained dimming and colour control that lighting designers need. This guide explains how they fit together.
KNX and DALI, who does what
Two buses, two jobs.
KNX controls the whole building, lighting, blinds, HVAC, scenes, and is the user-facing automation layer. DALI is dedicated to lighting: each ballast/driver is individually addressable on a two-wire DALI line and reports status and lamp failures back.
Rather than wiring every luminaire as a KNX device, a DALI subsystem groups them on a DALI line and exposes them to KNX through a gateway. KNX sees lighting functions; DALI does the precise per-luminaire work.
- KNX, whole-building automation and user control
- DALI, dedicated digital lighting bus per luminaire
- DALI drivers report status and lamp/ballast faults
- A gateway bridges the two
| DALI devices per line | 64 |
| DALI groups per line | 16 |
| DALI scenes per line | 16 |
| Wiring | 2-wire, polarity-free |
KNX-DALI gateways
The bridge that makes DALI a KNX citizen.
A KNX-DALI gateway sits on the KNX bus and drives one or more DALI lines. In ETS it exposes DALI luminaires, groups and scenes as KNX objects, so a KNX button or visualisation can switch, dim and set colour on DALI fixtures.
Gateways also surface DALI diagnostics, lamp failure, driver failure, as KNX status, which is invaluable for maintenance in commercial buildings. Choose a gateway by number of DALI lines, DT8 colour support and whether it provides DALI bus power.
- Exposes DALI luminaires/groups/scenes as KNX objects
- Maps KNX switch/dim/colour to DALI commands
- Reports DALI lamp/driver faults as KNX status
- Select by lines, DT8 support and bus-power provision
Dimming, tunable white and DT8
Where DALI earns its place.
DALI dimming is smooth and consistent because each driver is digital, no leading/trailing-edge guesswork as with analogue KNX dimmers. For colour and colour-temperature control, DALI Device Type 8 (DT8) standardises tunable white and RGB(W) so a gateway can drive human-centric lighting scenes.
If a project needs individually addressable fixtures, lamp-failure feedback, or tunable white, DALI via a gateway is usually the right tool. For a handful of simple on/off or dimmed circuits, native KNX switch/dim actuators can be simpler and cheaper.
- Digital dimming, smooth, repeatable, driver-independent
- DT8 standardises tunable white and RGBW colour
- Per-fixture addressing enables flexible re-grouping in software
- Human-centric lighting scenes via KNX → DALI DT8
When to choose KNX-DALI
Match the tool to the project.
Reach for KNX-DALI when you have many luminaires, need individual or flexible grouping, want lamp-failure reporting, or specify tunable/colour lighting, typical of offices, retail, hospitality and high-end residential.
Stay with native KNX dimming for small, fixed lighting layouts where DALI's addressing and feedback aren't needed. Virasmart specifies and programs both, and Ekinex offers KNX-DALI gateways within its range.
- Many fixtures or flexible grouping → DALI
- Lamp-failure feedback required → DALI
- Tunable white / colour scenes → DALI DT8
- Few fixed circuits → native KNX dimming
Planning a lighting-heavy KNX project in the Baltics? Virasmart designs KNX-DALI lighting with Ekinex and other certified gateways. Talk to us about your scheme.
Designing KNX lighting control?
From KNX-DALI gateways to tunable-white scenes, Virasmart engineers professional lighting control for projects across the Baltics.