I think I became aware of Coughtrie soon after buying a house in Glasgow in 1984 - as 2 of the SP10 units were fitted to the outside of the building.  I discovered happily that the firm was in Glasgow and went to buy another bigger SP10 (150W) to put over a garage after visiting the Hillington factory  (It cost £12.93 in August 1986!). I brought this one to my next house here in the South of England. I remember seeing these SP10 fittings everywhere and realised they must be the sort of good quality item specified by architects and other professionals. Pay more and get a quality item, that really lasts, and for which you can get spares years later. This suits me as someone who wants goods that do not break down within a few months, repairs things and keeps them going.  In the 1980s and 1990s this was NOT the zeitgeist at the retail level, but now I think it is becoming the proper thing to do, and rather "green"!

Paul M, South of England

Lighting Controls

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 Detector

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:

On/Off Sensor

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

Master/Slave Sensors

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