Smart lighting ranges from £30 Philips Hue bulbs to £400-per-point DALI systems. This guide covers the main protocols, neutral wire requirements for smart switches, recommended lux levels, daylight harvesting, presence detection, and costs by budget level.
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Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.
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Smart home lighting has moved from a luxury to a mainstream expectation in new-build and renovation projects. The range of available systems — from £30 smart bulbs to £400-per-point DALI installations — means that electricians need to understand the options well enough to advise clients and specify the right system for the project.
The electrician's role varies by system type: consumer smart bulbs require no additional wiring; smart switches require neutral wires at switch positions (which often means new cables); DALI systems require dedicated bus wiring and addressable drivers at each luminaire; KNX installations require specialist commissioning software and trained installers.
This guide covers the main lighting control protocols (DALI, KNX, Zigbee, Z-Wave), the neutral wire requirement for smart switches, recommended lux levels from CIBSE and BS EN 12464-1, scene setting and presence detection, and costs at different budget levels.
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Choosing the right protocol is the most important decision in a smart lighting project. The key factors are: budget, size of installation, required integration (with heating, AV, security), and the client's preferred control interface.
Digital addressable protocol. Each luminaire has an addressable DALI driver. Used in commercial and high-end residential. Individual control, two-way communication, BREEAM compatible. Requires DALI bus wiring (standard 2-core cable). Cost: £150 to £400+ per point.
Where DALI drivers supply 12 V LED tracks or other ELV luminaires operating as SELV circuits, Section 715 of BS 7671:2018+A4:2026 applies. FELV shall not be used (Reg 715.411.7.201); luminaires without a protective conductor terminal shall be supplied from a SELV source only.
Building automation bus — lighting, heating, blinds, and HVAC on one system. Requires specialist KNX-trained installer and commissioning software (ETS). High reliability and integration depth. Cost: £200 to £500+ per point for the lighting element.
Wireless mesh protocol. Wide device ecosystem. Requires a hub (Philips Hue Bridge, Zigbee2MQTT). Good for residential projects. Neutral wire required for most smart switches. Cost: £60 to £150 per point.
868MHz sub-GHz wireless. Better wall penetration than Zigbee. Strict interoperability standard. Smaller device ecosystem. Good for larger homes with thick walls. Cost: £80 to £180 per point.
DMX (Digital Multiplex) is used in theatrical and entertainment lighting and in high-end architectural RGB lighting installations — not a standard choice for residential smart lighting but may be encountered in bespoke home cinema or entertainment rooms.
The neutral wire requirement is the most common practical challenge when retrofitting smart switches to an existing installation. Most smart switches need a neutral wire at the switch position to power their electronics continuously. In standard UK wiring, the switch drop (from the ceiling to the switch) typically contains only:
Solutions for the neutral wire problem: (a) run a new 3-core and earth cable from a junction box (where the neutral is available) down to the switch position — this is the cleanest solution and is required for smart dimmer switches with higher power requirements; (b) use a no-neutral smart switch — these devices use a tiny leakage current through the load to power themselves. They work with many LED and halogen loads but may cause flicker or incomplete dimming with some LED drivers; (c) specify smart bulbs (Zigbee or WiFi) and retain the existing switch wiring — the switch remains on permanently and the smart bulbs are controlled by app or voice assistant only.
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Lux level recommendations guide the lighting design and help justify the luminaire count and type. Key reference documents are CIBSE LG3 (domestic), CIBSE LG7 (offices), and BS EN 12464-1 (workplace lighting):
Scene setting allows multiple pre-programmed lighting states (scenes) to be recalled at the touch of a button or via a voice command. A living room might have: "Morning" (300 lux, cool white 4000K), "Evening" (150 lux, warm white 2700K), "Cinema" (30 lux, amber), and "Reading" (400 lux at the reading chair, warm white). Scene programming is carried out during commissioning and is included in the installation cost.
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Start free trialAutomatic lighting controls significantly reduce energy consumption and improve convenience. The two most impactful technologies are presence detection and daylight harvesting:
PIR (passive infrared) or microwave/radar sensors detect occupancy and switch lights on when someone enters a space, off after a preset hold time when they leave. PIR is suitable for areas with normal movement; radar (microwave) detects minor movements and is preferred for offices and meeting rooms where occupants sit still for extended periods. Combined PIR/microwave sensors provide the best performance.
A photocell measures the natural daylight contribution and dims the artificial lighting to maintain a constant lux level at the working plane. Most effective in perimeter zones with good daylighting. Reduces lighting energy by 20 to 50% in spaces with good daylight access. Requires DALI-dimable or 0-10V drivers and a DALI or digital lighting controller.
For residential smart lighting, presence detection in hallways, stairways, and bathrooms provides convenience and energy saving. DALI presence detectors with built-in daylight sensors are available from manufacturers such as Zumtobel, Helvar, and Steinel — they communicate directly with the DALI bus without additional wiring.
Smart lighting costs vary enormously. Here is a guide by budget level for a typical residential installation:
Smart lighting is one of the most accessible routes into higher-value electrical work. A competent electrician who understands neutral wire requirements, can programme basic scenes on Lutron or Rako systems, and can install DALI bus wiring for commercial projects will find growing demand from both residential and commercial clients.
Before specifying smart switches, check whether a neutral wire is present at each switch position. If it is not, price the cost of running new cables as part of the smart lighting quote. Retrofitting without a neutral and then recommending a no-neutral switch that causes flickering is a common problem — avoid it by assessing the wiring at the survey stage.
Where smart lighting installation involves new circuits or new cable runs (not just replacing fittings on existing circuits), an Electrical Installation Certificate or Minor Works Certificate is required. Part P notification applies where new circuits are added to the installation.
Scene programming, presence detection calibration, and daylight sensor commissioning are specialist skills that command a day-rate premium over standard electrical work. Building competency in DALI and Lutron commissioning opens access to commercial and high-end residential projects.
Where smart lighting installation involves new or rewired final circuits in a domestic dwelling, two A4:2026 requirements apply:
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