Good fittings matter, but controls decide what you actually spend. Smart controls make light follow people, tasks and daylight, so energy use drops without hurting comfort or safety. Below we explain what works at home and on commercial sites, how much you can save and how to avoid the common pitfalls.
How lighting controls save money
Savings come from three simple ideas: don’t light empty space, don’t fight the daylight, and don’t run brighter than the task needs. That translates into occupancy sensing, daylight dimming and sensible schedules with manual overrides.
Controls at a glance
| Control | How it saves | Domestic use | Commercial use | Typical extra saving |
|---|---|---|---|---|
| Occupancy / Presence | Lights auto on/off when people arrive/leave. | Hallways, bathrooms, utility rooms, garages. | Aisles, stores, meeting rooms, WCs, corridors. | 15–35% |
| Daylight dimming | Reduces output when natural light is available. | Kitchens and living rooms with big windows or skylights. | Perimeter zones, offices with glazing, rooflights in warehouses. | 10–30% |
| Scheduling / Timeclock | Switches off after hours and trims weekend use. | Bedtime and away modes; porch/external timing. | Office floors, production lines, signage, external lighting. | 5–10% |
| Scene / Task tuning | Right light for the task, not max output all day. | Cooking, reading, TV scenes; dim-to-warm options. | Meeting presets, reception ambience, packing stations. | 5–15% |
| Central monitoring (DALI/D4i) | Keeps levels optimised; flags failures; automates testing. | Less common, but useful in large homes or apartments. | Great for multi-storey offices, warehouses and schools. | 5–12% + maintenance |
Worked examples
Home: three-bed semi
Replace standard switches with smart dimmers and PIR sensors in hall, WC and utility. Add daylight dimming in the kitchen with rooflights. Expect a 10–20% lighting reduction across the year, more in bright months. Comfort improves because light levels adapt instead of blasting at 100%.
Warehouse: 20,000 ft² with skylights
High-bay LED already installed at 0.45 W/ft². Add occupancy sensing in low-traffic aisles and daylight dimming under skylights. With 3,000 hours a year, controls typically trim a further 15–30% of lighting energy, while emergency self-test via DALI reduces manual testing time.
Spec tips that prevent headaches
- Set sensible time-outs: short for corridors, longer for offices so lights don’t drop mid-meeting.
- Position sensors so they see the actual movement in the task area, not the doorway.
- Commission daylight set-points on a bright day and verify with spot lux checks.
- Always include a manual override for cleaning, security and events.
- For commercial sites, plan emergency self-test and keep logbooks up to date.
What it costs and when it pays back
| Upgrade | Typical hardware | Install complexity | Payback guide |
|---|---|---|---|
| Domestic PIRs + smart dimmers | In-wall dimmers, ceiling PIRs | Low–medium (uses existing wiring) | 6–18 months |
| Commercial occupancy + schedules | PIR/dual-tech sensors, timeclock | Medium | 6–12 months |
| Daylight dimming zones | Photocells, dimmable drivers | Medium (commissioning needed) | 9–18 months |
| DALI/D4i with emergency self-test | Networked drivers, gateways | Medium–high (great scalability) | 12–24 months + maintenance savings |
Compliance and documentation
We design and commission to UK standards, with electrical works to BS 7671 and emergency lighting to BS 5266. Commercial projects include test certificates, logbooks and clear as-builts so facilities teams can keep everything compliant.
Smart Controls Savings Calculator
Estimate how much occupancy sensing, daylight dimming and scheduling can trim your lighting energy and costs.
Annual Energy & Cost
Savings
- — total reduction
- — kWh saved per year
- — £ saved per year
- — kg CO₂e avoided per year
Formulae: Baseline kWh = Area × LPD × Hours ÷ 1000. Combined reduction = 1 − (1−Occ)·(1−Day)·(1−Sched). These are estimates; we verify set-points on site with commissioning and lux checks.