What is DALI Lighting?

What Does DALI Stand For?

DALI stands for Digital Addressable Lighting Interface. It is an internationally standardised protocol (IEC 62386) that enables two-way digital communication between lighting control devices and individual luminaires. Unlike simple switching or 1-10V analogue dimming, DALI allows each luminaire on a circuit to be individually addressed, monitored and controlled — giving building managers precise, flexible control over every light fitting in a project.

How Does DALI Work?

A DALI system uses a dedicated two-wire control bus (polarity-free) that connects up to 64 individually addressable devices on a single DALI line. Each luminaire's DALI driver receives digital commands to dim, switch or report its status. Multiple DALI lines can be bridged via a DALI gateway or controller to manage entire buildings from a central BMS (Building Management System) or touchscreen interface.

DALI signals are low-voltage digital commands, not power signals — meaning the control wiring is separate from the mains supply. This makes DALI systems inherently safer, more flexible and easier to reconfigure than legacy analogue systems.

DALI vs DALI-2: What's the Difference?

DALI-2 is the current version of the standard, published under IEC 62386 Edition 2. The key improvements over original DALI (sometimes called DALI-1) include:

• Mandatory interoperability testing — DALI-2 devices from different manufacturers are guaranteed to work together • Standardised input devices — sensors, switches and push-buttons are now part of the standard (Part 301-304) • Improved colour control — dedicated commands for tuneable white and RGBW colour mixing • Extended diagnostic reporting — lamp failure detection, power consumption monitoring and operating hours tracking

All EOS wired control solutions are DALI-2 compliant, ensuring full interoperability across multi-brand installations.

Benefits of DALI Lighting Controls

• Individual luminaire control — dim, switch and configure every fitting independently • Scene setting — store and recall pre-programmed lighting scenes for different activities or times of day • Daylight harvesting — automatically dim luminaires near windows when natural light is sufficient • Occupancy sensing — integrate PIR or microwave sensors to switch off lights in unoccupied zones • Energy monitoring — track power consumption per luminaire for accurate carbon reporting • Future-proof flexibility — reassign groups and scenes via software without rewiring • Reduced commissioning time — digital addressing replaces complex wiring schedules

Where is DALI Used?

DALI is the default control protocol for specification-grade commercial LED lighting. Common applications include:

• Offices — desk-level dimming, daylight linking and occupancy-based switching • Healthcare — circadian lighting schedules, ward-level scene control and emergency integration • Education — classroom scene presets, corridor dimming and energy reporting for DEC compliance • Retail — zoned lighting scenes that adapt to trading hours, promotional displays and seasonal themes • Hospitality — lobby, restaurant and conference room scene management

EOS offers both wired DALI-2 and wireless Plexus control systems, giving specifiers the choice between hardwired reliability and retrofit-friendly wireless flexibility.