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.