DALI-2 vs Casambi: Which Control System Defines Modern EU Projects?

What Changed — and Why It Matters Now

At XHLWX (led-project-light.com), a Custom Indoor LED Lighting Manufacturer based in China, our engineering team is fielding more questions than ever about the fundamental choice in lighting controls: the robust, wired DALI-2 standard versus the flexible, wireless Casambi ecosystem. The debate isn't new, but the context has fundamentally shifted in 2024.

This is no longer a simple discussion of wired versus wireless; it's a strategic decision impacting project cost, occupant well-being, long-term energy consumption, and compliance with increasingly stringent regulations like the EU's Ecodesign for Energy-related Products (ErP) Directive (EU) 2019/2020. The decision made at the specification stage has profound consequences for contractors, facility managers, and end-users for the next decade.

The industry has reached a crucial inflection point. DALI-2, governed by the DALI Alliance and based on the IEC 62386 standard, has matured into a truly interoperable and certifiable system.

The "-2" signifies a massive leap from the original DALI, mandating stringent testing and certification for all components, from drivers to input devices like sensors and switches. This guarantees that a DALI-2 certified sensor from one brand will work seamlessly with a DALI-2 certified driver from another, eliminating the integration headaches of the past.

It has solidified its position as the gold standard for large, complex new builds like hospitals, airports, and multi-story office towers where structured cabling is planned from day one and integration with a central Building Management System (BMS) is paramount.

Simultaneously, Casambi, leveraging the power and ubiquity of Bluetooth Low Energy (BLE) Mesh, has shed its reputation as a solution for only small-scale or residential projects. Its technology has proven reliable and scalable enough to manage entire office floors and complex, multi-zone retail environments.

The primary driver for its adoption is flexibility. In renovation projects, particularly in historic buildings or fast-paced retail spaces, the cost and disruption of running new control wiring are prohibitive.

Casambi bypasses this entirely, with each luminaire becoming a smart node in a self-healing mesh network. Commissioning, once the domain of highly-trained specialists with laptops, can now be done visually and intuitively on a tablet by on-site technicians, drastically reducing setup time and enabling easy reconfiguration as space layouts change.

This shift makes smart, tunable, and scene-based lighting accessible for a much wider range of commercial projects.

The Technical Detail Behind the Headline

To understand the practical implications, it's essential to see how these control choices integrate into a physical luminaire. The control protocol is just one parameter in a complex specification.

A modern, high-performance linear LED luminaire must deliver on all fronts: optical performance, control versatility, physical durability, and certified safety. Below is a typical specification table for a versatile luminaire, such as our XHLWX ProLinear-75, designed for architectural and commercial interiors.

Note how the control system is a configurable choice alongside other critical performance metrics.

Need the DIALux evo file or IES / LDT data for this setup?Get lighting files →

What This Means for Specifiers and Buyers

The choice between DALI-2 and Casambi is not a matter of which is "better," but which is the right fit for the project's unique constraints and goals. A US-based architect specifying for a European client must navigate not only the technology but also local installation practices and compliance norms. The decision tree branches based on the answers to a few key questions about the project's scale, use case, and future.

How Should I Specify Controls for a New, Multi-floor Corporate Headquarters?

For a large-scale new construction, DALI-2 is almost always the superior choice. The key advantage is structured, centralized management.

During construction, electricians run a simple two-core bus cable alongside the mains power to every luminaire location. This creates a robust, physically secure network backbone.

A single DALI bus can control up to 64 individually addressable drivers, and a building can contain hundreds of these buses, all managed through DALI routers that can interface with a central BMS. This allows a facility manager to monitor the real-time status, energy consumption, and operating hours of every single light in a 50,000 square meter building from a single dashboard.

This level of granular control and data reporting is invaluable for predictive maintenance and energy optimization, enabling strategies like daylight harvesting and presence detection on a massive scale, potentially saving up to 70% in lighting energy costs compared to a non-controlled system.

What Is the Best Control Option for a High-end Retail Flagship Store Renovation?

Here, the pendulum swings decisively toward Casambi. Retail environments demand flexibility and speed.

A brand may want to change its store layout, spotlight new merchandise, or update lighting scenes for a seasonal promotion. With a wired system, such changes could require costly rewiring and recommissioning by a specialist.

With Casambi, the entire network is wireless. Luminaires are installed, powered on, and then commissioned using a simple app on a tablet.

An employee can visually select lights, group them, and create new scenes in minutes without touching a wire. This agility is a powerful commercial advantage.

Furthermore, Casambi's ecosystem includes a wide range of wireless input devices, from elegant battery-powered wall switches (like the EnOcean series) to sensors that can be placed anywhere, preserving the clean aesthetic of a high-design interior.

Can I Use a Hybrid Approach That Combines DALI-2 and Wireless Controls?

Yes, and for many complex projects, this is the optimal solution. It is not an either/or decision.

Gateways exist that bridge the DALI-2 and wireless worlds. A common strategy is to use a DALI-2 backbone for the building's core and shell lighting—corridors, stairwells, back-of-house areas—leveraging its robustness and BMS integration.

Then, within tenant spaces like individual office suites or conference rooms, a Casambi network can be deployed to provide users with flexible, app-based control over their local environment. A DALI-to-Casambi gateway allows the central BMS to issue master commands (e.g., 'all lights off at 8 PM') while still permitting local wireless override and scene setting.

This hybrid model offers the centralized management and energy reporting of DALI-2 with the user-facing flexibility and ease of use of Casambi.

Compliance Checklist (IES / LDT / DIALux / CE / RoHS / ErP)

Regardless of the control system specified, a European or US contractor must ensure the chosen luminaires meet a strict set of compliance and data requirements. Failure to do so can halt a project or lead to non-compliance with building codes.

1. Photometric Data (IES & LDT): Your manufacturer must provide IES (for North America) and LDT (for Europe) photometric files for every specified luminaire and optic combination. These are the digital DNA of the light fixture.

2. Lighting Simulation (DIALux): These IES/LDT files are imported into lighting design software like DIALux or Relux. This is not optional; it is a required step to prove that the lighting design will meet legal and client requirements before purchase. The simulation verifies metrics like illuminance levels (e.g., ensuring an average of 500 lux on office desks), uniformity, and, crucially, Unified Glare Rating (UGR). For office spaces, EN 12464-1 mandates a UGR of < 19.

3. European Market Compliance (CE, RoHS, ErP):

   • CE Mark: This is a mandatory declaration that the product complies with all applicable EU directives, including the Low Voltage Directive (LVD) and the Electromagnetic Compatibility (EMC) Directive.
   • RoHS (Restriction of Hazardous Substances): The product must be certified as free from specific hazardous materials like lead and mercury.
   • ErP (Energy-related Products): As of September 1, 2021, the (EU) 2019/2020 and (EU) 2019/2015 regulations require stricter energy efficiency from light sources and drivers. Using advanced controls like DALI-2 or Casambi is a key strategy for meeting the highest efficiency classes and documenting the potential energy savings in kWh for the client.

A specifier's 'next step' is to build a compliance package request into their RFQ, demanding these files and certificates from potential manufacturing partners.

Frequently Asked Questions

Q: What Is the Typical Cost Difference Between DALI-2 and Casambi Systems?

For hardware and installation, DALI-2 has a higher initial cost due to the 2-core bus wiring and specialized routers. However, on very large projects with over 1,000 nodes, the per-point cost can become competitive. Casambi avoids wiring costs, but the per-luminaire cost for a Casambi-enabled driver or node can be higher than its DALI-2 equivalent. The total project cost depends on scale and labor rates.

Q: What Are the Scalability Limits I Should Be Aware Of?

A single DALI-2 network (bus) supports up to 64 control gear addresses and 64 input device addresses. Large buildings use multiple DALI buses connected by routers, scaling to tens of thousands of nodes. A standard Casambi 'Classic' network supports up to 250 nodes in a single mesh. Multiple networks can be created and managed, but centralized control across a vast campus is more natively handled by DALI-2 architecture.

Q: Is Wireless Lighting Control Secure Enough for Corporate Environments?

Yes, when implemented correctly. DALI-2's security lies in its physical, wired nature—access requires physical presence. Casambi's security is digital, based on the robust Bluetooth Mesh standard. It uses multiple layers of authentication and encryption for network access and communication. For a corporate client, it's crucial to set strong, unique network passwords and manage access rights carefully, just as with their Wi-Fi network.

Q: How Does Commissioning Time Compare for a Typical 200-luminaire Office Floor?

DALI-2 commissioning requires a trained technician using specialized software connected to the bus. It involves addressing each device, programming groups, and setting up sensor logic. This could take 1-2 days. For a 200-node Casambi project, an electrician can install the lights, and a technician can commission the entire floor using a tablet in as little as 3-4 hours by visually identifying and grouping lights in the app.

Talk to Our Engineering Team

Ultimately, the choice between DALI-2 and Casambi is a strategic one, deeply intertwined with the project's scale, budget, use-case, and long-term operational goals. The technical nuances are significant, and making the right call requires a clear understanding of both the possibilities and limitations of each system.

At XHLWX (led-project-light.com), a Custom Indoor LED Lighting Manufacturer based in China, we specialize in manufacturing luminaires compatible with all major control protocols. Our engineering team is ready to consult with specifiers, architects, and contractors in the EU, US, and Middle East to analyze your project requirements and help you specify the optimal luminaire and control solution, complete with all necessary IES/LDT files and compliance documentation.