DALI / D4i
The lighting control protocol and the intra-luminaire standard.
What Is D4i? The Intra-Luminaire DALI Standard
DALI 2.0 vs DALI 1: What Actually Changed and Why It Matters for Fixture Makers
D4i vs DALI-2: What D4i Adds on Top of DALI-2
Related products
DALI LED Drivers
DALI-2 / D4i certified
DALI 2.0 LED Driver
DT8 colour control
Applications
Smart buildings
D4i puts driver, sensor and power-data on one DALI bus for fixture-level control.
Stadiums & arenas
Per-luminaire addressing enables zone dimming and energy logging at scale.
Offices
Occupancy and daylight harvesting cut energy while keeping comfort.
Street & outdoor
NEMA/D4i nodes enable remote dimming and fault reporting per pole.
DALI-2 vs D4i vs 0-10V: Lighting Control Compared
Control choice trades data richness against cost and wiring simplicity.
| Topology | Bus, addressed | Bus + data, addressed | Analog 0-10V |
|---|---|---|---|
| Sensors | Via bus power | On-bus (D4i) | Separate |
| Data | Limited | Rich (energy, diag) | None |
| Cost | Mid | Higher | Low |
Choose D4i when you want sensor data and diagnostics on the bus. Choose DALI-2 for addressed control without data. Choose 0-10V for simple dimming.
Frequently Asked Questions
What is D4i exactly?
D4i extends DALI-2 with standardized, certified data for drivers, sensors and power supplies on the same bus.
Do D4i drivers need a controller?
They run on a DALI bus; a controller or gateway manages scenes, while each node stores its own data.
Are D4i products interoperable?
Yes, D4i certification guarantees plug-and-play interchange across certified vendors.
Can I mix DALI-2 and D4i?
Yes. D4i is a superset of DALI-2, so certified DALI-2 gear coexists on the same bus.
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