When designing a lighting control system for a commercial building, the protocol question comes up early: DALI-2 or Casambi BLE Mesh? Both handle dimming, grouping, scene control and sensor integration. But they take fundamentally different approaches, and choosing the wrong one for a project creates real problems down the line.
DALI-2 is a wired protocol standardized under IEC 62386, widely used in projects where reliability and regulatory compliance are non-negotiable. Casambi is a wireless protocol built on Bluetooth Low Energy Mesh, valued for its installation speed and flexibility, particularly in retrofit projects or spaces that change frequently.
This article explains what DALI-2 is, compares it directly against Casambi BLE Mesh on key technical criteria, and provides a decision framework by project type. There is no universally correct answer: there is a better fit and a worse fit depending on the specific project.
What is DALI-2?
DALI-2 is the current version of the Digital Addressable Lighting Interface standard, defined in the IEC 62386 series. It is a bidirectional wired protocol: a DALI master controller communicates with LED drivers or ballasts (DALI control gear) over a dedicated bus pair, which can share the same conduit as mains cabling but must be kept electrically separate.
Compared to DALI-1, DALI-2 introduced three significant improvements:
Mandatory certification: devices must pass interoperability testing by the DALI Alliance before they can be labelled DALI-2. This guarantees that a driver from manufacturer A works with a controller from manufacturer B without configuration surprises.
Standardized input devices: IEC 62386 Part 300 and above define push buttons, occupancy sensors and daylight sensors as first-class participants on the bus. DALI-1 only addressed output devices (drivers and ballasts).
Multi-master support: multiple controllers can coexist on the same bus, which simplifies integration with BMS platforms or layered control architectures.
Each DALI-2 bus supports up to 64 control gear, 64 input devices, 16 groups and 16 scenes. The main device types are DT6 (LED driver dimming), DT8 (color control including tunable white and RGB) and DT4 (fluorescent ballasts, now largely legacy). Multiple bus segments can be combined through DALI gateways to scale to larger installations.
Casambi BLE Mesh: a quick summary
Casambi is a wireless lighting control protocol built on Bluetooth Low Energy Mesh. Every Casambi device (driver, module, sensor) is an independent mesh node that self-routes and relays signals. There is no mandatory central hub.
A single Casambi network supports up to 250 nodes with no limit on groups or scenes. Commissioning is done entirely through a smartphone app, with no specialist software or wired laptop connection required.
For a deeper look at the BLE Mesh architecture, see the article What is BLE Mesh in this cluster.
Technical comparison: DALI-2 vs Casambi BLE Mesh
The following covers the criteria that matter most when a System Integrator or M&E engineer is selecting a protocol for a project:
Topology: DALI-2 is a wired bus, limited to 64 devices per segment, requiring dedicated control cabling. Casambi is a wireless mesh, supporting up to 250 nodes per network, with no additional cabling beyond the existing power infrastructure.
Commissioning: DALI-2 requires specialist commissioning software (Tridonic Toolbox, DALI Cockpit or equivalent) and a wired laptop connection to the bus. Casambi is commissioned entirely through an iOS or Android app with no additional equipment.
Interoperability: DALI-2 certification ensures drivers from any compliant manufacturer (Tridonic, Osram, Helvar, Inventronics and others) work together on the same bus. Casambi requires drivers that either have a built-in Casambi module or accept an add-on module such as the CBU-ASD or CBU-TED.
Reliability: DALI-2 is unaffected by RF interference, making it suitable for industrial environments. Casambi operates on the 2.4 GHz band and can be affected by high RF noise environments such as factories with variable-speed drives or high-density WiFi deployments.
BMS integration: DALI-2 integrates directly into BMS platforms via DALI gateways supporting BACnet, KNX or Modbus. Casambi integrates via the Casambi API or dedicated Casambi-to-BACnet/Modbus gateway devices.
Emergency lighting: DALI-2 supports IEC 62386 Part 202 for emergency lighting, a mandatory compliance requirement in many building types. Casambi does not currently have an equivalent standard.
Coverage range: DALI-2 is constrained by device count per bus segment rather than physical distance. Casambi BLE nodes have a typical range of 10-15m between nodes under normal conditions; large or heavily partitioned floor plates require careful mesh density planning.
DALI-2: strengths and limitations
DALI-2 has the most robust standardization foundation in commercial lighting. That brings real advantages, but also constraints that matter on certain project types.
Strengths:
High reliability with no RF interference susceptibility, well suited for industrial environments
Strong interoperability: drivers from multiple manufacturers can be mixed on the same bus
Emergency lighting compliance under IEC 62386 Part 202
Deep BMS integration via standard protocols (BACnet, KNX, Modbus)
Long product lifecycle, stable open standard not dependent on a single vendor
Limitations:
Requires dedicated control cabling: increases installation cost and complexity in retrofit
64-device bus limit: requires additional bus segments and gateways as scale grows
Commissioning requires specialist software and expertise
DALI-2 certified drivers carry a price premium over standard on/off drivers
Casambi BLE Mesh: strengths and limitations
Casambi was built to solve the flexibility problem that DALI-2 handles poorly. But that flexibility has trade-offs worth understanding before committing to it.
Strengths:
No dedicated control cabling required: significant cost saving in retrofit installations
Fast commissioning via app, with easy reconfiguration after handover
Up to 250 nodes per network with no limit on groups or scenes
Well suited for spaces with frequent layout changes (flexible offices, showrooms, retail)
Rich sensor integration (occupancy, daylight, temperature) natively on the mesh
Limitations:
2.4 GHz band operation: susceptible to interference in high RF-noise environments
Driver selection is constrained to Casambi-ready products or add-on module compatibility
No emergency lighting standard equivalent to IEC 62386 Part 202
Single-vendor dependency on Casambi Technologies for firmware and platform
BLE mesh coverage requires careful design on large or heavily partitioned floor plates
The hybrid approach: DALI-2 drivers with Casambi CBU-ASD
On many real projects, the answer is not one or the other but a combination of both. The most common formula is to use high-quality DALI-2 certified drivers for the luminaires, combined with a Casambi CBU-ASD module as the bridge.
The CBU-ASD (Casambi Bluetooth Unit, Analog/DALI Slave) mounts in the electrical panel, connects to the drivers via the DALI-2 bus, and presents them as standard nodes on a Casambi BLE Mesh network. The result is that the fixtures appear in the Casambi app like any other node: dimmable, groupable, scene-capable and compatible with Casambi sensors.
This approach lets projects take advantage of the wide DALI-2 driver ecosystem (multiple manufacturers, broad price range) while keeping the flexible commissioning and operational experience that Casambi provides. In practice across Vietnam, this hybrid configuration is common in 4-star and 5-star hotels and Grade A offices where the owner wants both: the wired reliability of DALI-2 and the ease of use of Casambi.
Which protocol for which project?
The following decision framework is based on project type, drawing on technical criteria and practical installation experience:
Factories, warehouses, industrial facilities: choose DALI-2. High RF noise from motors and variable-speed drives demands a wired protocol. Control cabling is typically included in the base build.
Hospitals and healthcare facilities: choose DALI-2. Emergency lighting compliance to IEC 62386 Part 202 is mandatory, and wired reliability is required for life-safety systems.
New-build offices: DALI-2 or hybrid. If deep BMS integration is required, go with DALI-2. If the priority is simplified commissioning and day-to-day operation, the DALI-2 driver plus CBU-ASD hybrid is the practical choice.
Office retrofit: choose Casambi. No ceiling disruption for additional cabling, fast commissioning, easy reconfiguration when tenants change.
Hotels and resorts: hybrid is the most common choice. Guest rooms work well with Casambi; public areas with emergency lighting requirements use DALI-2 drivers with CBU-ASD.
Showrooms and retail: choose Casambi. Seasonal layout changes, rapid scene adjustment without involving a commissioning engineer, and no fixed cable topology to work around.
Conclusion
DALI-2 and Casambi BLE Mesh are not competing for the same use case. DALI-2 prioritizes reliability, open standardization and infrastructure-level integration. Casambi prioritizes installation speed, operational flexibility and wireless convenience. The DALI-2 driver plus CBU-ASD hybrid is increasingly the default for premium projects in Vietnam that need both.
To discuss which approach fits your project, contact us via hotline 0918.918.755 or email sales@knxstore.vn.
