01
The central twilight switch
One switch disconnects the luminaires from the supply entirely during the day. It solves the problem typical of sensor luminaires, which come on by day, and the standing consumption of the sensors themselves.
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Lighting for corridors and common parts
Light that comes on when it is needed and stays off entirely during the day. Corridors, stairwells and common parts, switched so nobody walks in the dark and nothing burns for an empty building.
Scope
What it covers
02
PIR or HF
PIR senses heat and draws about 0.05 W. An HF radar sensor sees through a thin partition but draws up to 0.3 W, which across dozens of them in a building adds up. The space decides which is used.
03
Corridors and stairwells
In an apartment building the sensors switch the corridor, stairwell and common-part lighting. They are placed so nobody takes a step in the dark and so the light does not come on from movement behind a door.
04
Not only light
The same sensor can switch the hot water circulation pump. The pump then runs when somebody is moving about the building rather than continuously — a saving nobody experiences as an inconvenience.
05
What it saves
The saving is not in the lamp but in the light not burning for nobody. A corridor that was lit all night is lit for a minute after somebody passes — and the central twilight switch adds the whole day when it is not lit at all.
06
Emergency lighting
Common parts usually carry emergency lighting beside the ordinary sort, which has to work when the power fails. It is a separate system with its own checks, and it is dealt with together because it follows the same route.
07
Changing to LED
When luminaires are being changed for LED it pays to do the switching while the ceiling is open. The LED itself saves on power, the sensor and the twilight switch save on hours — and the second saves more than the first.
Handed over
What you get
- [1] Sensors fitted and set for time and sensitivity
- [2] The central twilight switch wired and tested
- [3] A walk through the corridor tested in the dark and by day
- [4] An inspection report for the altered part
Common questions
Questions about lighting
Why does the light come on by day?
A sensor luminaire relies on its own twilight detector, which in a dark corridor reports darkness at midday. The central twilight switch fixes it by disconnecting the luminaires during the day.
Can the on-time be set?
Yes, the run-on time is set at the sensor. We set it so a person crosses the whole stairwell on one switching and the light does not go out between floors.
Will an HF sensor trigger from inside a flat?
It can, if it is badly placed — it sees through a thin partition and through a door. So a corridor beside flats gets PIR, or the HF is aimed and turned down until it covers the corridor only.
How many lights can one sensor take?
It depends on its rating and on the luminaires. LED draws little power but a high inrush current, so that is what is counted rather than the watts — otherwise the sensor contact burns out sooner than expected.
Can a dim light stay on?
Yes, some luminaires can sit dimmed and come to full output on movement. In an apartment building that answers the feeling of safety without lighting the place fully all night.
Why is a sensor in the lamp not enough?
Because it relies on its own twilight detector, which in a dark corridor reports darkness at midday. A central switch settles the whole building at once and with one setting.
Do you replace the luminaires too?
Yes, and it pays to do it together with the switching. The ceiling is opened once; going up a second time is wasted work.
On their own
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Advice or a call-out
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0902 481 461Tell us what is happening, or what needs inspecting. We agree the scope, the price and the next free date on the phone. If you cannot get through, we are on a job and will call you back.