Smart lighting systems: DALI 2 and IoT
Led Lighting · Lesson 23 · Intermediate
Purpose
Design DALI-2 and IoT lighting as commissioned control systems with offline/failure, security and privacy requirements.
Learning objectives
- Define the design boundary
- Use current product/project evidence
- Calculate with stated assumptions
- Verify maintained and failure performance
DALI-2 provides certified interoperable controlgear/control devices on a local bus; IoT platforms can add gateways, analytics and remote management. Connectivity does not replace local safe operation.
Core theory
Verify exact DALI-2 products in the public database, allowed parts/features, bus power/current/voltage drop, addressing, groups, scenes, sensors and emergency DT1 behavior.
Specify power-up/system-failure levels, manual override, occupancy/daylight logic, time schedules, emergency override, commissioning backup and replacement workflow.
For IP/cloud gateways define network segmentation, authentication, updates, encryption, logging, data minimization, retention, ownership and operation during internet/cloud outage. Do not expose safety testing to insecure remote control.
| Term | Meaning | Symbol | Unit |
|---|---|---|---|
| DALI-2 | Certified IEC 62386-based digital lighting ecosystem | Not applicable | Not applicable |
| Gateway | Bridge between control protocols/networks | Not applicable | Not applicable |
| Failure level | Declared light output after communication/system failure | Not applicable | Not applicable |
Assumptions: Supplied values are fictional design inputs; Exact current standards and photometric/product data remain governing.
- Architecture: Local control can continue if scenes/logic and time dependencies are locally available.
- Define: Specify fallback level/manual override and behavior if controller or bus also fails.
- Test: Commission offline, gateway-failure and restoration states, not just normal cloud control.
Design for documented local operation/fallback; cloud availability must not be a single point of basic lighting control.
Reasonableness check: The answer distinguishes average screening from point, uniformity, glare, emergency and maintained-performance requirements.
- Treating standby lighting as identical to escape lighting
- Using initial lumens without utilization or maintenance losses
- Selecting color quality or glare from one headline number
Where this appears in practice
Complete lighting design coordinates visual task, occupants, fire strategy, photometry, emergency modes, controls, energy, maintenance and verification.
Knowledge check
Does a DALI-2 logo on one device prove the complete multi-vendor system is commissioned?
No. Certification supports interoperability; design, addressing, features and tests remain.
Answer: No. Certification supports interoperability; design, addressing, features and tests remain.
Practical exercise
Create an offline/failure/cyber/privacy test matrix for a DALI-2 system with IoT gateway.
Summary
- Emergency category follows risk and activity
- Average lux is only one design metric
- Controls must fail to a documented safe/useful state
Sources and review
- BS 5266-1:2025: Emergency lighting code of practice: BSI; 2025; United Kingdom
- SLL Code for Lighting: CIBSE / Society of Light and Lighting; Current edition and application guidance must be confirmed; United Kingdom
- CIE position statement on colour quality metrics: CIE; Second edition, 2025; International
- DALI-2 and DALI Emergency certification: DALI Alliance; Current product database/status must be checked; International
Editorial review date: 2026-08-22. Professional electrical review is pending.