Lighting Controls
Summary
Lighting controls range from wall switches and dimmers to occupancy and vacancy sensors, daylight-responsive photosensors, timeclocks, and networked systems using wired or wireless communication, including luminaire-level controls. Energy codes require automatic shutoff, daylight response, and multilevel control, so control zones, protocol, sequences, and commissioning must be designed with the lighting layout.
Cols
Terminology
- Occupancy sensor: turns lights on automatically and off after vacancy
- Vacancy sensor: manual on, automatic off; saves more energy
- PIR / ultrasonic / dual technology: sensing by heat motion, sound reflection, or both
- Daylight-responsive control (daylight harvesting): photosensor dims lights in daylit zones
- Primary and secondary sidelit zones / toplit zone: daylight areas near windows and skylights
- High-end trim / task tuning: limiting maximum output to save energy
- 0-10V: analog dimming; one-way; dimming curves not standardized
- DALI-2: digital addressable protocol; two-way status; 64 devices per bus
- DMX: theatrical and color-changing control protocol
- NLC: networked lighting controls; wired or wireless with central software
- LLLC: luminaire-level lighting control; sensor and node in each fixture
- Commissioning: setting and verifying sensor timing, zones, and sequences
Standards
Ratings
- Energy codes set which spaces need occupancy, time-switch, daylight-responsive, and multilevel control
- DLC NLC qualification lists networked systems with required capabilities
Test standards
- ASHRAE 90.1 and IECC lighting control provisions as adopted
- DALI-2 certification (DiiA) for interoperable digital devices
- DLC NLC technical requirements
Components
- Wall stations: switches, dimmers, scene keypads
- Sensors: ceiling, wall, and fixture-integrated occupancy and daylight sensors
- Power packs and relays: switching and dimming of load circuits
- Gateways and software: network control, scheduling, and reporting
- Timeclocks and astronomical controllers: exterior and after-hours control
- Emergency relays: UL 924 relays for emergency luminaires on controlled circuits
Detailing
- Define control zones on the lighting plan: daylight zones, occupancy zones, and scene zones
- Match driver dimming protocol to the control system; avoid mixing 0-10V driver brands on one zone
- Locate sensors for coverage, avoiding HVAC drafts and doorways that cause false triggers
- Write a sequence of operations and require functional testing and commissioning
- Coordinate with emergency lighting so egress lights operate on power loss
- Plan for owner training and access to the control software
Uses
Specific uses
- Open and private offices
- Classrooms
- Warehouses with high-bay sensors
- Parking garages and site lighting
- Conference and multipurpose rooms with scenes
Pros and cons
Pros
- Large energy savings beyond LED efficiency
- Required by energy codes in most commercial work
- Networked systems give data, scheduling, and easy rezoning
- Better occupant comfort with dimming and scenes
Cons
- Poor commissioning causes nuisance shutoffs and complaints
- Proprietary systems limit interoperability
- Wireless systems need IT coordination and security
- Added first cost for sensors, nodes, and software
Manufacturing and cost
Construction
- Devices and sensors installed with low-voltage or wireless links; power packs at loads
- Systems programmed and commissioned; functional testing documented
Main manufacturers and suppliers
- Lutron
- Acuity Brands (nLight)
- Legrand (Wattstopper)
- Crestron
- Enlighted
- Cooper Lighting Solutions
Trade associations: DesignLights Consortium and National Electrical Manufacturers Association.
Typical costs
- Controls portion of commercial interior lighting: about $1.75 per sq ft of floor area on average in one 2026 breakdown
Sources
- Inside Lighting: lighting controls take focus in the latest 90.1 energy standard, https://inside.lighting/news/26-06/lighting-controls-take-focus-latest-901-energy-standard
- CMD: 0-10V, DALI, and other lighting control protocols compared, https://cmd-ltd.com/lighting-control-systems/0-10v-dali-and-other-lighting-control-system-protocols-compared
- Inside Lighting: lighting controls interoperability and DALI, https://inside.lighting/news/24-02/lighting-controls-interoperability-dali-difference
- Acuity Brands nLight: IECC 2024 applications guide, https://nlight.acuitybrands.com/-/media/abl/nlight/files/resources/application-guides/iecc-applications-guide-2024.pdf
- DesignLights Consortium: networked lighting controls, https://designlights.org/
- New Rising Sun Arts Centre: commercial lighting cost per sq ft, 2026, https://new.risingsunartscentre.org/news/commercial-lighting-cost-per-square-foot-2026.html
- Wikimedia Commons: Wiring diagram of lighting control panel for dummies.JPG, by Dmitry G (CC BY-SA 3.0), https://commons.wikimedia.org/wiki/File:Wiring_diagram_of_lighting_control_panel_for_dummies.JPG