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Lights that follow people and daylight
Bisly switches and dims the lighting by presence, daylight and timetable, room by room. DALI-2 runs addressable luminaires, and TRIAC dimmers run the dimmable circuits a building already has. Both sit in the same system as heating and ventilation, so one sensor, one controller and one BMS run the whole room.
Light where people are, at the level the room needs
Presence control
Lights switch on when someone comes in and off when the room is empty. Microwave sensors see the small movements of someone working at a desk, so nobody has to wave an arm.
Daylight harvesting
A light sensor reads the level at the desks and dims the luminaires to add only what daylight does not give. The rows by the windows dim first, and the level stays constant through the day.
Scenes and timetables
Each room type gets its light levels and scenes once, in the digital twin: a meeting room for presenting, a classroom for an exam, a corridor at night. Timetables and holidays apply to every room at once.
Tunable white
DALI-2 colour-temperature drivers shift from cooler light in the morning to warmer light in the afternoon, for offices and schools that want human-centric lighting.
What lighting control saves
Lighting control is a mature technology and its savings are well documented. A Lawrence Berkeley National Laboratory meta-analysis of 240 savings estimates from 88 studies of commercial buildings found these average savings in lighting energy. Bisly uses the same strategies: presence, daylight, light levels per zone, and all of them together.
from presence sensors that switch off empty rooms
from daylight harvesting
from setting the light level per room or zone, so no space is lit brighter than it needs
from combining the strategies
Averages across field studies and case studies. What a building saves depends on how each room is used and how the lighting was controlled before.
Rooms that stand empty save the most
Lighting energy saved by presence sensors alone, by room type. Daylight harvesting and zone light levels come on top.
| Room type | Lighting energy saved by presence sensors |
|---|---|
| Restrooms | 30-90% |
| Corridors | 30-80% |
| Storage areas | 45-80% |
| Warehouses and halls | 35-54% |
| Classrooms | 40-46% |
| Conference and meeting rooms | 45% |
| Private offices | 13-50% |
| Break rooms | 29% |
| Open-plan offices | 10% |
In open-plan offices, where someone is almost always present, daylight harvesting and zone light levels save more than presence control.
Two ways to control the lights, one system
Choose per floor or per room. New buildings and full refurbishments usually take DALI-2; buildings that keep their luminaires and cabling take TRIAC dimmers. Both run in the same BMS and app.
| DALI-2 | TRIAC | |
|---|---|---|
| Luminaires | DALI-2 drivers, addressed one by one | Dimmable LED, halogen and incandescent loads on existing circuits |
| Controller | Bisly DALI Bridge 2 (LD02): one DALI-2 line of 64 control gears per bridge, on Ethernet | UM6D: 6 channels of 240 W in the switchboard; UMD: 2 channels of 220 W behind the wall switch |
| Dimming | Per luminaire, with colour temperature and colour where the driver supports it | Per channel, leading or trailing edge set in software |
| Sensors | Bisly Presence Sensor (SP01-D2) and High-bay sensor (SP02-D2) on the DALI-2 line | UMS Supersensor, black or white: presence (PIR as standard, radar as an option), light level, colour temperature and air quality |
| Wall switches | Existing switches become DALI-2 inputs through the Bisly DALI Input 4 (LI04-D2) | Impulse switches on the dimmer inputs: 6 on the UM6D, 2 on the UMD |
| Best for | New build, full refurbishments, open-plan offices, halls | Retrofits that keep the luminaires and cabling, smaller rooms, apartments |
The devices
DALI-2 lighting
- Bisly DALI Bridge 2 (LD02): the floor's DALI-2 application controller, with bus power on board and schedules on its own clock
- Bisly Presence Sensor (SP01-D2): microwave presence and lux, DALI-2 and D4i certified
- Bisly Presence Sensor High-bay (SP02-D2): PIR and lux for ceilings up to 10 m
- Bisly DALI Input 4 (LI04-D2): 4 push buttons onto the DALI-2 line, in the wall box
TRIAC lighting
- Bisly UM6D 6-channel dimmer: 6 x 240 W, leading or trailing edge, 6 switch inputs
- Bisly UMD 2-channel dimmer: 2 x 220 W, fits a 68 mm wall box behind the switch, 2 switch inputs and a 1-Wire bus for temperature sensors
- Bisly UMS Supersensor, black or white: PIR presence in a 4 m radius as standard or radar presence as an option, 0.1-30,000 lx and colour temperature, plus CO₂, VOC, humidity and temperature
Every device is pre-configured from the digital twin and added by scanning its QR code. Datasheets and EU declarations of conformity are on the documents page.
How daylight harvesting holds the level
Measure
The sensor reads the light level at the desks, every few seconds.
Compare
It compares the reading with the level set for the room type, for example 300 lx or 500 lx in a classroom under EN 12464-1.
Dim
The luminaires add only the difference: the rows by the windows dim first, the rows further in stay brighter.
Hold
The level stays where it should through the day, and the room switches off when nobody is in it.
One sensor for the lights and the climate
The same presence signal that switches the lights also sets back the heating and lowers the ventilation in an empty room. The UMS Supersensor measures presence, light, temperature, humidity, CO₂ and VOC in one ceiling device, so a room needs one sensor instead of three.
Bisly UMS Supersensor, available in black or white.
Where it fits
Offices
Open-plan floors on DALI-2 with presence and daylight per zone, meeting rooms with scenes, corridors that dim when empty.
OfficesSchools
Each classroom holds 300 lx or 500 lx as EN 12464-1 sets out, daylight dims the window rows and the sports hall gets high-bay sensors.
SchoolsStock offices and halls
High-bay presence sensors for halls and loading areas up to 10 m, office lighting on its own schedule.
Stock officesRetrofit
TRIAC dimmers behind the existing switches and in the switchboard, so the luminaires and cabling stay.
RetrofitLighting projects on Bisly
A pilot for the Tallinn Education Department: classrooms brought up to 500 lx with more LED luminaires and 2 Bisly multisensors per classroom, controlled from the classroom computer, a wall switch or the Bisly app.
View projectLED luminaires and presence-based control in the common areas of a municipal kindergarten.
View projectAn existing office building retrofitted with DALI and on/off lighting, heating, access and blinds control.
View projectSend us the lighting plan. Get a fixed price in 5 working days.
Bring the lighting plan or a room schedule to a 30-minute call. You get the scope and a fixed price for lighting, heating and ventilation in one offer.