Lighting Controls & Smart Systems
A complete technical reference to wired and wireless control protocols, sensors, building management integration, and intelligent lighting design — from DALI-2 and D4i to IoT-enabled city-scale platforms.
1. Introduction & Regulatory Framework
Modern lighting design does not end at luminaire selection. The control system determines how light is delivered, adapted, and managed throughout a building's lifetime. Intelligent controls turn a static installation into a responsive, energy-efficient, and occupant-centred environment — reducing energy consumption by 30–70 % beyond LED-only savings and enabling data-driven facility management.
This guide covers every major control protocol and technology used in professional lighting: from the industry-standard DALI-2 bus to wireless mesh networks, from simple analogue dimming to city-scale IoT platforms. It is protocol-focused rather than space-specific, complementing TECHLUMEN's application guides (office, healthcare, education, warehouse, etc.) with the "how to control" layer.
Why Controls Matter
Regulatory Landscape
European energy legislation increasingly requires lighting controls, not merely recommends them. The Energy Performance of Buildings Directive (EPBD 2024 recast) mandates building automation and control systems (BACS) for non-residential buildings above defined energy thresholds. National energy performance codes across EU member states translate this into specific requirements — each country has its own implementation timeline and minimum automation class.
| Standard / Directive | Scope | Control Relevance |
|---|---|---|
| EPBD 2024 (EU recast) | Building energy performance | Mandates BACS for large non-residential buildings; defines Smart Readiness Indicator (SRI) |
| EN 15232-1 | Building automation impact on energy | Classes A–D rating system for automation; baseline for national codes |
| IEC 62386 (series) | DALI protocol | Parts 101–104 (system), 2xx (device types), 3xx (input devices/sensors) |
| IEC 62560 | Self-ballasted LED lamps | Safety & compatibility for retrofit dimming |
| EN 12464-1 / -2 | Workplace lighting | Illuminance levels that controls must maintain |
| EN 1838 / EN 50172 | Emergency lighting | Automatic transfer, testing, DALI-202 emergency gear |
| EN 50491 (series) | HBES / BACS requirements | Electrical safety, EMC, environmental conditions for control devices |
| IEC 62442-3 | Energy performance of control gear | Standby power limits for drivers and controllers |
| EU Reg. 2019/2020 | Ecodesign for light sources | Standby < 0.5 W, control-gear efficiency minimums |
2. Standards & Building Automation Classification
EN 15232-1 provides a classification framework that rates a building's automation level from D (no automation) to A (high energy performance with integrated smart controls). This classification directly influences the energy performance certificate and is referenced by national building codes across Europe.
EN 15232 Automation Classes — Lighting Functions
| Class | Description | Occupancy | Daylight | Dimming | Scheduling | Typical Saving vs D |
|---|---|---|---|---|---|---|
| D | No automation (manual only) | — | — | — | — | Baseline |
| C | Standard automation | Auto on/off | — | — | Basic | 10–15 % |
| B | Advanced automation | Presence + absence | Switching | Step | Optimised | 25–40 % |
| A | High energy performance | Presence + absence + zone linking | Continuous regulation | Continuous | Adaptive + CMS | 40–60 % |
Smart Readiness Indicator (SRI)
Introduced by the EPBD recast, the Smart Readiness Indicator rates a building's technological capacity to interact with occupants and the energy grid. Lighting contributes to multiple SRI domains:
| SRI Domain | Lighting Contribution | Technologies |
|---|---|---|
| Energy efficiency & demand response | Load shedding, peak-shifting via scheduling | DALI-2, CMS, astronomical clock |
| Comfort & wellbeing | Tunable white, personal dimming, circadian profiles | DALI DT8, Casambi, HCL scenes |
| Predictive maintenance | Lamp-hour tracking, fault reporting, driver diagnostics | D4i, DALI-2 diagnostics, CMS |
| Information to occupants | Dashboards, app control, usage reporting | IoT gateways, cloud CMS, BACnet |
| Grid flexibility | Real-time power adjustment on grid signal | OpenADR, DALI broadcast dimming |
3. Protocol Overview — Wired vs Wireless
Lighting control protocols fall into two broad families: wired bus systems (requiring dedicated control cabling) and wireless mesh or point-to-point networks. Each has distinct strengths, and modern installations frequently combine both — for example, DALI-2 wired backbone with Casambi wireless commissioning, or KNX building integration with DALI lighting subnets.
Protocol Selection Criteria
| Criterion | Wired (DALI, KNX, DMX) | Wireless (Casambi, Zigbee, BLE) |
|---|---|---|
| New construction | Preferred — plan cabling during build | Viable, but unnecessary if conduit available |
| Retrofit / renovation | Costly if no existing bus cable | Ideal — no cable disruption |
| Heritage / listed buildings | Often impractical (protected fabric) | Preferred — minimal physical intervention |
| High reliability (hospitals, data centres) | Preferred — no RF interference risk | Backup wired recommended |
| Colour-changing / RGBW | DMX512 primary; DALI DT8 growing | Casambi, Zigbee support RGBW |
| Large campus / outdoor | KNX backbone + DALI subnets | LoRaWAN for street; BLE mesh for zones |
| Commissioning flexibility | ETS / DALI software required | Smartphone app (Casambi, Zigbee hubs) |
| Long-term support | IEC/ISO standards, 20+ yr track record | Vendor ecosystem dependent |
4. DALI-2 & D4i Architecture
DALI (Digital Addressable Lighting Interface) is the dominant professional lighting control protocol worldwide. DALI-2, standardised in IEC 62386, introduced mandatory interoperability certification, input devices (Part 3xx — sensors, push buttons), and standardised colour control (DT8). D4i extends DALI-2 with in-luminaire power and energy data, enabling IoT-ready luminaires with a standardised data interface via the Zhaga Book 18 smart connector.
DALI-2 System Architecture
DALI-2 vs Legacy DALI (v1)
| Feature | DALI v1 (IEC 60929 Annex E) | DALI-2 (IEC 62386) |
|---|---|---|
| Certification | Self-declaration | Mandatory DALI Alliance testing |
| Interoperability | Often problematic between vendors | Guaranteed by certification |
| Input devices | Not standardised | Part 3xx — sensors, buttons, sliders |
| Colour control | Not standard | DT8 — Tc, XY, RGBWAF |
| Emergency | Basic | DT1 (Part 202) — auto-test, status reporting |
| Diagnostics | Limited | Extended memory banks, fault data |
| Multi-master | Not defined | Application + system controllers, collision avoidance |
D4i — The IoT Extension
D4i adds three critical data channels to DALI-2 drivers, transforming each luminaire into a data point on the building network:
| D4i Memory Bank | IEC 62386 Part | Data Provided | Benefit |
|---|---|---|---|
| Luminaire data | Part 251 | Manufacturer, product ID, installation date, operating hours | Asset management & warranty tracking |
| Energy data | Part 252 | Active power (W), cumulative energy (Wh), operating time | Sub-metering per luminaire |
| Diagnostics | Part 253 | LED module health, driver temperature, failure predictions | Predictive maintenance |
DALI Design Rules
| Parameter | Specification | Design Implication |
|---|---|---|
| Addresses per line | 64 control gear + 64 input devices | Plan DALI lines by zone; add lines for larger floors |
| Groups | 16 per line (broadcast + 16 groups) | Map to lighting zones: window, middle, corridor |
| Scenes | 16 per control gear | Preset levels for different tasks (teaching, screen, exam) |
| Bus cable | 2-core, no polarity, max 300 m at 1.5 mm² | Can share conduit with mains; no star/daisy/tree restriction |
| Bus power supply | 1 per DALI line, 16 V / 250 mA | Integrated in some controllers; standalone units available |
| Fade time | 0–90 s, logarithmic curve | Logarithmic dimming follows human perception |
| Minimum dim level | 0.1 % (physical min) to 1 % typical | Check driver spec for actual minimum |
5. Analogue Protocols: 0-10 V, 1-10 V, Mains Dimming
Before digital buses, analogue voltage-based dimming was the only option. These protocols remain relevant in simple installations, retrofits, and residential applications. Understanding their limitations is essential for advising when to upgrade to DALI-2.
0-10 V vs 1-10 V
| Feature | 0-10 V (IEC 60929 Annex A) | 1-10 V (IEC 60929 Annex E) |
|---|---|---|
| Signal range | 0 V = off, 10 V = 100 % | 1 V = minimum (~1–3 %), 10 V = 100 % |
| Source current | Controller sources current (active) | Driver sources current (passive/sink) |
| Off state | 0 V = luminaire off | Requires separate mains switching; 1 V = minimum (not off) |
| Wiring | 2-wire signal + mains | 2-wire signal + mains (switched) |
| Direction | Unidirectional only | Unidirectional only |
| Max fixtures per controller | ~50 (current-limited) | ~50 (current-limited) |
| Addressing | None — broadcast only | None — broadcast only |
| Common use | North America, Asia | Europe (traditional) |
Mains (Phase-Cut) Dimming
Phase-cut dimming controls power by cutting part of each AC half-cycle. Two methods exist:
| Type | Mechanism | Load Compatibility | Typical Use |
|---|---|---|---|
| Leading-edge (TRIAC) | Cuts start of half-cycle | Resistive, some LED drivers (check compatibility) | Residential, hotels (retrofit) |
| Trailing-edge (MOSFET/IGBT) | Cuts end of half-cycle | LED-optimised, capacitive loads | Modern residential, hospitality |
6. DMX512 & KNX — Entertainment & Building Automation
DMX512 / RDM
DMX512 (ANSI E1.11) is the entertainment and architectural colour-changing protocol. Each "universe" carries 512 channels, with each channel an 8-bit value (0–255). An RGBW luminaire typically uses 4–7 channels (R, G, B, W, dimmer, strobe, mode).
| Parameter | DMX512 | RDM (E1.20) |
|---|---|---|
| Direction | Unidirectional (controller → fixtures) | Bidirectional (added to DMX cable) |
| Channels | 512 per universe | Same infrastructure |
| Refresh rate | ~44 Hz (full universe) | Slower when polling |
| Cable | 5-pin XLR or Cat5 (EIA-485) | Same |
| Topology | Daisy-chain, terminated | Same |
| Addressing | DIP switches or menu | Remote addressing & discovery |
| Feedback | None | Lamp hours, temperature, sensor data |
| Best for | Façade lighting, RGBW, media, stage | Same + remote commissioning |
KNX — Building-Wide Integration
KNX (ISO 14543-3) is a building automation bus protocol covering not only lighting but also HVAC, blinds, security, and energy management. It is the European standard for multi-trade building control, particularly in commercial and institutional buildings.
| Feature | Specification |
|---|---|
| Medium | TP (twisted pair), IP, RF, PLC |
| Topology | Line → area → backbone (up to 65,536 devices) |
| Programming | ETS (Engineering Tool Software) — certified integrators only |
| Data rate | 9600 baud (TP) / 100 Mbps (IP) |
| Lighting interface | KNX/DALI gateway: KNX commands → DALI luminaires |
| Strengths | Multi-vendor interoperability, 20+ yr ecosystem, combined trades |
| Weakness | High engineering cost, specialist required for commissioning |
7. Wireless: Casambi, Zigbee, Bluetooth Mesh & More
Wireless lighting control has matured rapidly, offering cable-free installation, smartphone commissioning, and cloud connectivity. The key technologies differ in mesh architecture, range, power consumption, and ecosystem openness.
Wireless Protocol Comparison
| Feature | Casambi | Zigbee 3.0 | Bluetooth Mesh (SIG) | EnOcean | LoRaWAN |
|---|---|---|---|---|---|
| Radio | Bluetooth Low Energy | IEEE 802.15.4 | Bluetooth 5.x | Sub-GHz / BLE | Sub-GHz LPWAN |
| Mesh | Yes (proprietary stack) | Yes | Yes (SIG standard) | No (star/repeater) | No (star-of-stars) |
| Nodes per network | 250+ (typical) | 65,000 (theoretical) | 32,767 | ~128 per gateway | Thousands per gateway |
| Range (indoor) | 10–30 m per hop | 10–30 m per hop | 10–30 m per hop | 30 m (sub-GHz) | 2–5 km outdoor |
| Gateway needed | No (phone = gateway) | Yes (coordinator) | Optional | Yes | Yes |
| Commissioning | iOS/Android app | Hub + app | App / provisioner | Teach-in button | Network server |
| Cloud / remote | Yes (Casambi cloud) | Hub-dependent | Via gateway | Via gateway | Native (network server) |
| Power source | In-driver module | Battery or mains | Battery or mains | Energy harvesting | Battery (5–10 yr) |
| Best application | Retail, hospitality, renovation, galleries | Smart home, campus | Open commercial | Switches, sensors (no battery) | Street lighting, outdoor, city CMS |
| Open standard | Proprietary | Open (Zigbee Alliance) | Open (Bluetooth SIG) | Open (EnOcean Alliance) | Open (LoRa Alliance) |
Casambi — In-Depth
Casambi is the most widely adopted wireless control platform in professional architectural lighting. It uses Bluetooth Low Energy (BLE) with a proprietary mesh layer, requiring no dedicated gateway — any smartphone or tablet acts as the interface. The control module is typically embedded inside the LED driver or available as an external node (Casambi CBU).
8. Sensors & Daylight Harvesting
Sensors are the eyes of the lighting control system — detecting presence, measuring ambient light, and in advanced systems, counting people or monitoring air quality. Correct sensor selection and placement is critical; a poorly positioned sensor can waste more energy than no sensor at all.
Sensor Types
| Sensor Type | Detection Method | Typical Range | Best Application | Limitation |
|---|---|---|---|---|
| PIR (Passive Infrared) | Body heat (IR radiation change) | Ø 6–12 m (ceiling), 12–20 m (corridor lens) | Offices, corridors, toilets | Requires movement; misses seated, still occupants |
| Microwave (HF) | Doppler radar (5.8 GHz) | Ø 8–20 m, through partitions | Open plan, warehouses, stairwells | Can detect through thin walls (false triggers) |
| Dual-tech (PIR + HF) | Both methods required | Combination of above | High-reliability zones, toilets | Higher cost; minor detection lag |
| Ultrasonic | Sound waves (25–40 kHz) | Ø 6–10 m | Partitioned offices, restrooms | Air currents, HVAC noise can cause false triggers |
| Photoelectric (lux) | Ambient light level | N/A (point measurement) | Daylight harvesting zones | Placement critical — avoid direct sun, luminaire light |
| Combined (presence + lux) | PIR/HF + photoelectric | As PIR/HF | Most commercial applications | Sensor must be DALI-2 Part 303 for best integration |
Sensor Placement Strategy
Daylight Harvesting
Daylight harvesting (also called daylight-linked dimming) continuously adjusts artificial light output to maintain a target illuminance on the work plane, compensating for available daylight. When properly implemented, it delivers the single largest energy saving of any control strategy — 40–60 % in perimeter zones.
| Parameter | Recommendation |
|---|---|
| Sensor orientation | Ceiling-mounted, facing downward toward the task plane — never pointing at windows or luminaires |
| Sensor position | 2/3 of the daylight zone depth from the window wall (e.g., at 4 m in a 6 m deep zone) |
| Regulation method | Closed-loop (sensor measures actual combined light on desk) preferred over open-loop (sensor measures daylight only) |
| Target setpoint | Maintained illuminance per EN 12464-1 (e.g., 500 lux for offices) |
| Fade rate | Slow (30–60 s) to avoid perceptible dimming changes |
| Minimum output | 10–15 % (not off) — maintains presence of artificial light for occupant comfort |
| Dead band | ± 20 % around setpoint to prevent hunting / oscillation |
9. CMS, IoT & Cybersecurity
A Central Management System (CMS) transforms individual luminaires and sensors into a coordinated, monitored, and optimised network. At building scale this means a software dashboard; at city scale it encompasses thousands of street luminaires managed over LoRaWAN or cellular networks.
CMS Functions
| Function | Description | Benefit |
|---|---|---|
| Remote monitoring | Real-time status of every luminaire (on/off, dim level, faults) | Reduces site visits, enables rapid fault response |
| Scheduling | Time-of-day, day-of-week, astronomical clock profiles | Automated dimming, night setback, holiday modes |
| Energy reporting | Per-luminaire, per-zone, per-building kWh data | Sub-metering for LEED/BREEAM, utility billing |
| Fault management | Automatic alerts for lamp/driver failure, overheating | Predictive maintenance, reduced downtime |
| Firmware updates | Over-the-air (OTA) driver/sensor updates | Feature upgrades without rewiring |
| Demand response | Grid signal triggers load reduction (OpenADR) | Revenue from grid services, peak avoidance |
| Occupancy analytics | Space utilisation heatmaps from sensor data | Facility planning, desk sharing optimisation |
Cybersecurity for Connected Lighting
As lighting systems connect to IP networks and cloud platforms, they become potential entry points for cyber threats. The following table outlines minimum security practices:
| Layer | Threat | Mitigation |
|---|---|---|
| Device (luminaire/sensor) | Firmware tampering, backdoor access | Signed firmware, secure boot, disable unused ports |
| Network (DALI, IP, wireless) | Eavesdropping, man-in-the-middle | TLS 1.3 for IP links, BLE encryption, VLAN segmentation |
| Gateway | Unauthorised access to controller | Strong passwords, 2FA, MAC filtering, firewall rules |
| Cloud / CMS | Data breach, account compromise | SOC 2 / ISO 27001 certified platforms, encrypted storage |
| Physical | Tampering with exposed controllers | Locked enclosures, tamper alerts, IP-rated housings |
10. Energy Savings & Payback
The financial case for lighting controls is compelling, particularly when layered on top of LED upgrades. While LEDs reduce energy per lumen, controls reduce unnecessary operating hours and over-illumination — compounding the savings.
Control Strategy Savings Stack
| Control Strategy | Typical Saving (%) | Applies To | Investment Level |
|---|---|---|---|
| LED retrofit (baseline) | 40–60 % | All spaces | €€ (luminaires + drivers) |
| + Occupancy sensing | +20–30 % | Corridors, toilets, meeting rooms, warehouses | € (sensors + wiring) |
| + Daylight harvesting | +20–40 % | Perimeter zones (< 6 m from façade) | € (lux sensors) |
| + Time scheduling | +10–15 % | All spaces (cleaning, security, night setback) | € (controller programming) |
| + Task tuning | +10–15 % | Over-lit spaces (reduce max output to actual need) | Free (commissioning adjustment) |
| + Personal dimming | +5–10 % | Individual desks, private offices | € (wall panel or app) |
| Combined total vs legacy fluorescent | 70–85 % |
Payback Calculation Method
EN 15232 Energy Impact Factors
| Building Type | Class D → C (%) | Class D → B (%) | Class D → A (%) |
|---|---|---|---|
| Offices | 10 % | 28 % | 51 % |
| Lecture halls / classrooms | 8 % | 24 % | 46 % |
| Hospitals | 6 % | 18 % | 34 % |
| Hotels | 12 % | 32 % | 52 % |
| Retail | 14 % | 35 % | 56 % |
| Warehouses | 15 % | 38 % | 58 % |
11. Common Mistakes
| # | Mistake | Consequence | Correct Practice |
|---|---|---|---|
| 1 | Exceeding 64 DALI addresses per line | Devices fail to respond; commissioning fails | Plan DALI lines early; count all control gear including emergency and sensors |
| 2 | Lux sensor mounted under luminaire | Sensor reads its own light → hunting / oscillation | Mount between luminaire rows, at 2/3 daylight zone depth |
| 3 | PIR sensor in toilet only detects entry | Lights turn off while occupant is in cubicle | Use dual-tech sensor or multiple PIR with overlapping coverage |
| 4 | Specifying 0-10 V where zone control is needed | All luminaires dim together; no individual control | Specify DALI-2 for any multi-zone installation |
| 5 | TRIAC dimmer with incompatible LED driver | Flickering, audible buzz, limited dimming range | Match dimmer to driver compatibility list; prefer trailing-edge |
| 6 | No VLAN segmentation for lighting IoT | Lighting network exposed to IT security threats | Dedicate VLAN for lighting; firewall to CMS only |
| 7 | Vacancy timeout too short (< 5 min) | Frequent false-offs annoy occupants, reduce trust in system | 15–20 min for offices; 10 min for corridors; 30 min for classrooms |
| 8 | Commissioning values left at factory defaults | Occupancy profiles, dim levels, scene presets not matched to actual space | Always commission on-site: walk-test sensors, calibrate lux, set scenes |
| 9 | No standby power budget for controls | 1–3 W per luminaire standby erodes energy savings | Specify drivers with < 0.5 W standby; D4i enables true off |
| 10 | Mixing DALI v1 and DALI-2 on same line | Interoperability issues, inconsistent behaviour | Specify DALI-2 certified gear throughout; test before mass deployment |
12. TECHLUMEN Control Capabilities
TECHLUMEN luminaires are designed for professional control integration. The following table summarises the control options available across the product range. All DALI and 0-10 V options support dimming; tunable white and RGBW are available on selected models.
Control Protocol Support by Product Family
| Product | DALI-2 | 0-10 V | Bluetooth | Casambi | DMX512 | Tunable White | RGBW | Emergency |
|---|---|---|---|---|---|---|---|---|
| QL-60 (panel) | ✓ | ✓ | ✓ | ✓ | ✓ | — | — | Em 3h |
| QL-12030 (panel) | ✓ | ✓ | ✓ | ✓ | ✓ | — | — | Em 3h |
| QUDO-60 (premium panel) | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ (tunable CCT) | — | Em 3h |
| QUDO-60-AS (clinical) | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ (tunable CCT) | — | Em 3h |
| VISION (anti-glare) | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ (tunable CCT) | — | Em 3h |
| L-E-XT (linear) | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ (tunable CCT) | — | Em 3h |
| DL-17 / DL-23 (downlight) | ✓ | — | ✓ | ✓ | ✓ | — | — | Em 3h |
| VELISTI (sealed linear) | ✓ | ✓ | ✓ | ✓ | ✓ | — | — | Em 1h / 3h |
| HBR (high-bay) | ✓ | ✓ | ✓ | ✓ | ✓ | — | — | Em 3h |
| INDUS (industrial) | — | — | — | — | — | — | — | — |
| BONO-120 (gallery track) | ✓ | — | — | ✓ | ✓ | — | — | — |
| LUMO (gallery track) | ✓ | — | — | ✓ | ✓ | — | — | — |
| DROMOS (street) | ✓ | ✓ | — | — | — | — | — | — |
| FL-I-1 / FL-I-2 (floodlight) | ✓ | ✓ | — | ✓ | ✓ | — | — | — |
| TICO-RGBW (landscape) | — | — | — | ✓ | ✓ | — | ✓ | — |
| QUADRO-M (projector) | ✓ | ✓ | — | ✓ | ✓ | — | optional | — |
| iLO (solar) | — | — | — | — | — | — | — | Autonomous |
Recommended Control Configurations by Application
| Application | Recommended Protocol | Key Features | TECHLUMEN Products |
|---|---|---|---|
| Open-plan office | DALI-2 + daylight sensors | Zone dimming, occupancy, daylight harvesting, 5+ scenes | QL-60, QUDO-60, VISION, L-E-XT |
| Classroom / lecture hall | DALI-2 + wall panel | Scene recall (Teach, Screen, Exam, Clean), tunable white optional | QL-60, QL-12030, VISION, L-E-XT |
| Hospital ward | DALI-2 DT8 + HCL | Circadian profiles, patient bedhead control, nurse override | QUDO-60-AS, VELISTI |
| Retail / gallery | Casambi or DALI-2 | Flexible scene changes, app-based commissioning, track dimming | LUMO, BONO-120, L-E-XT |
| Warehouse | DALI-2 + HF sensors | Aisle-by-aisle occupancy, high-bay dimming, scheduling | HBR, VELISTI |
| Street / urban | DALI-2 + LoRaWAN CMS | Midnight dimming, astronomical clock, remote monitoring | DROMOS, CIVITA |
| Façade / landscape | DMX512 / Art-Net | RGBW colour changing, dynamic scenes, pixel control | TICO-RGBW, QUADRO-M, SPECTRA-2 |
| Sports field | DALI-2 + DMX512 | Instant on/off, broadcast dimming for TV flicker-free, pre-match ramp | FL-I-1, FL-I-2 |
Zhaga-D4i Ready Products
TECHLUMEN's outdoor luminaire range (DROMOS, CIVITA, CYCLOP-2, PERIUS) supports the Zhaga Book 18 socket, enabling snap-on sensor nodes, BLE beacons, or LoRaWAN gateways without opening the luminaire. This future-proofs the installation for CMS integration, traffic sensing, environmental monitoring, or air quality measurement — all from a single luminaire pole.