As you are aware I have specified your luminaires and adaptations to older versions of some of them for thirty years. I have found your luminaires well designed, robust and basically fit for purpose which has been proven by their longevity of life. I have stated many times rather flippantly that "Coughtrie luminaires are the best things to have come out of Glasgow". I have no doubt that when the right scheme arises I will be specifying your products again.
There are many different lighting controls available in the market today. We have provided a brief description of the functions of the sensors we provide at Coughtrie. For further details on each please contact us.
Dusk to Dawn Sensor
These work in the same way streetlights function, in that they only turn on when it becomes dark. A photocell measures ambient light levels so that above a user defined lux level the light stays off, and when the lux level falls below this value (default 70lux) the light is switched on and remains on until the ambient light increases to sufficient levels.
Possible Uses: Outdoor Lighting, Underpasses
Microwave detectors have mostly replaced PIR motion detecting sensors. These detectors work by emitting microwaves and measuring the reflected wave to detect motion. They are far more reliable than PIR sensors as they do not rely on changing temperatures to detect motion, and can penetrate glass, plastic and thin metal, meaning they can be housed inside the luminaire. Additionally, these sensors can detect ambient light levels. This allows the user to set the ambient light threshold level, meaning the light will only function (turn on when movement is detected) when light levels fall below this threshold. There are different sensor functions available:
When movement is detected the light switches on. After a user-defined period of inactivity the light automatically switches off.
Possible Uses: Toilets, doorway entrances,
Corridor Function Sensor
When movement is detected the light switches on. After a chosen period of inactivity the light dims down for a period of time, then switches off completely. Can also be set to be permanently on, staying dimmed when no movement is detected.
Possible Uses: Hallways, underpasses, offices, pedestrian walkways and cycling paths
If movement is detected by the 1st sensor (master sensor) it triggers other sensors, which are too far out of range to detect movement, to turn on via RF radio wave transmission. This is useful when an entire hallway or stairwell is to be lit when movement is detected, without having to wire each light together so they turn on in unison.
Possible Uses: Stair wells, car parks