Frequently Asked Questions (FAQ)

What is Bluetooth Low Energy?

Bluetooth Low Energy:

It's a state-of-the-art wireless technology and the only low power wireless technology in all modern smartphones, tablets and even smart watches. Making it the most popular and mainstream future proof low power radio technology. This technology can be integrated into fixtures, LED-drivers and even the LED-module.

What is a PIR presence detector?

PIR presence detector:

A PIR presence detector works by detecting the movement of body heat. The 'switching' occurs due to an infrared signature being registered as differing from one point to another.

PIR (Passive Infrared) Detectionn

What is a Microwave presence detector?

Microwave presence detector:

Microwave presence detectors are sensitive to movement and are ideal for large spaces and areas that have an awkward shape or where fine motion detection is required. They can detect through glass, therefore careful consideration on location is needed in certain applications.

Microwave Detectors

What is a motion detector?

Motion detector:

A motion detector is a device that detects moving objects, particularly people. Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area. They form a vital component of security, automated lighting control, home control, energy efficiency, and other useful systems. Motion detectors are also known as 'presence detectors'.

What is an occupancy sensor?

Occupancy sensor:

An occupancy sensor is an indoor motion detecting devices used to detect the presence of a person to automatically control lights or temperature or ventilation systems. The sensors use infrared, ultrasonic, microwave, or other technology. The term encompasses devices as different as PIR sensors, hotel room keycard locks and smart meters. Occupancy sensors are typically used to save energy, provide automatic control, and comply with building codes. Occupancy sensors are also known as 'presence detectors'.

What is daylight harvesting?

Daylight harvesting:

With daylight harvesting, lights are dimmed up or down in respond to ambient levels of daylight to maintain a set light level as specified by the designer to meet the relevant standards required. Daylight harvesting is also known as 'Maintained illuminance' and 'Daylight monitoring'.

What is a PIR sensor?

PIR sensor:

A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion or presence detectors.

What is a LUX level sensing detector?

LUX level sensing:

LUX level sensing detectors only turn lights on when natural light falls below a pre-set level.

How is presence detection used for lighting control?

Presence detection:

Detectors will switch on lighting automatically when a person enters the room, and switch off lighting automatically when no movement is detected.

Presence Detection

How is absence detection used for lighting control?

Absence detection:

Upon entering the room the person switches on the light as normal, but on leaving the absence detector switches off the lighting automatically.

Absence Detection

In lighting control systems, what is absence recovery?

Absence recovery:

After an occupancy time out period has elapsed in absence mode, the unit temporarily enters a presence mode for 10 seconds allowing the occupants movement to bring the lights back on.

Absence Recovery

In lighting control systems, what is switch detection time?

Switch detection time:

This ensures that if a switch is activated and no movement is detected the lights will switch off after 10 seconds, minimising unnecessary lit space.

Switch Detection Time

In lighting control systems, what is graduated dimming?

Graduated dimming:

With 'Graduated Dimming', the lighting within a space dims progressively from the source of natural illuminance in response to changes in natural light levels. This maximises the use of daylight within a space and minimises energy consumption and over-lighting of the space.

Graduated dimming

In lighting control systems, what is corridor hold?

Corridor hold:

In a building, when lights are on in a room, the corridors lights are held on to allow for safe exit or movement around the building.

In lighting control systems, what is a notional corridor?

Notional corridor:

'Notional corridors' are corridors of light, keeping working staff safe and secure whilst providing significant energy savings compared to illuminating an entire large open plan office for example.

What is a Sensor Ready presence detector?

Sensor Ready presence detector:

By connecting to an SR certified driver, a Sensor Ready (SR) presence detector does not need a separate power supply, saving both cost and installation space. Sensor Ready (SR™) is a robust standard for connected lighting control. The SR protocol supports IoT two-way communication for a new generation of lighting control applications.

What is a KNX presence detector?

KNX presence detector:

KNX is the worldwide standard for unifying all communication between intelligent devices that light, heat and ventilate homes and buildings. A KNX presence detector can be either PIR or microwave; and its features can include:

  • Absence detection
  • Walk test LED
  • Light level sensor
  • ELV switch inputs
  • Infrared remote control sensor to facilitate control of lighting
  • User-configurable logic functions and timers

Configuration of devices on the KNX bus takes place via the standard ETS software application, allowing all aspects of the presence detector's behavior to be configured and controlled.

What do the IP ratings mean in product specs?

IP ratings:

The IP (International Protection) rating given to one of our products is a two digit code indicating the degree of protection its enclosure provides. The first digit represents protection against penetration by solid objects accessing hazardous parts, the second describing the enclosures, protection against the ingress of water. An X in place of either digit means that either the enclosure has not been tested, or that the test is not applicable.

We currently supply products that comply with IP40, IP54, IP55 or IP65. The details of each rating are as follows:

  • IP40: Protected against solid objects over 1mm, e.g. wires, nails etc.
  • IP54: Protected against dust limited ingress, not harmfull deposits. Protected against water splashed from all directions, limited ingress permitted.
  • IP55: Protected against dust limited ingress, not harmfull deposits. Protected against low pressure jets of water from all directions, limited ingress permitted.
  • IP65: Totally protected against dust. Protected against low pressure jets of water from all directions, limited ingress permitted.
  • IP66: Protected from total dust ingress. Protected from high pressure water jets from any direction.

What is a voltage free contact?

Voltage free contact:

The output channel comprises a mains voltage relay capable of on/off switching. The unit provides an isolated voltage free contact output.

In lighting control systems, what does 'walk towards' mean?

Walk towards:

Walking towards the sensing area of a PIR detector may result in later detection as it is possible to 'walk towards' the PIR sectors without crossing them (which is required for detection).

Walk Towards

In lighting control systems, what does 'walk across' mean?

Walk across:

Walking across the detection area of a PIR detector results in a rapid detection because multiple sectors are crossed quickly triggering the detector.

Walk Across

What's the difference between a 2-wire and a 3-wire switch?


A 2-wire switch doesn't require a neutral connection.


A 3-wire switch requires a neutral connection. Three wire switches can manage different loads with increased electrical safety.

How does SELV switching improve electrical safety?

SELV switching

SELV switching stands for 'Safety Extra Low Voltage'. A low voltage current runs between a switch and the lighting luminare / system. This reduces the risk of electrical shocks, removing the need for mains voltage switch wires and an RCD to comply with IEE 17th Edition regulations.

On a timer, what is the function of a Slave Switch?

Slave Switch

Slave push button switches allow one timer to be controlled from a number of locations. Also known as a 'bell switch'.