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Technical Support

Explanation of order code suffixes

Throughout the website we use a range of suffixes in our order codes to assist customers in specifying the correct variant of a product. We have made them as intuitive as we can, and we use them as consistently as possible. Here is a summary of the main ones used:

Dimming options

For dimming wiring diagrams, please view our dimming control signals page.

DD- Dali dimming or Switch dim.

DA – DALI dimming. Control with a digital signal compliant with IEC 62386.

SD – Switch-dim. Dimmable using a retractive switch.

CF – Corridor function. A form of step dimming (typically from 10% to 100%) controlled with a momentary mains input.

MD – Mains dimming. Dimming via a phase dimmer, switching the mains input at 100Hz.

1-10 – Analogue dimming with a variable voltage, but this is only available by special request and has been replaced in many applications by switch-dim.


MM – MyMesh. Fitted with node & DALI gear to work on wireless mesh network.

MMDAM3 – MyMesh with DALI Addressable Emergency. Fitted with node, DALI mains gear & DALI addressable emergency gear to work on wireless mesh network.

Finishes and colours

We have a standard set of suffixes to indicate finishes and colours where a choice is offered:

WH – White

BK – Black

CH – Chrome, with a polished or mirror finish.

SCH – Satin chrome.

Emergency options

M3 – Maintained 3 hours. Under normal conditions the lights are switched on and off as the users require. In the event of a mains failure the lights will illuminate (usually at a reduced level of 5-15% of normal output) for 3 hours using integral batteries.

NM3 – Non-maintained 3 hours. Under normal conditions these lights are off and they only illuminate in the event of a mains failure.

STM3 – Self-test maintained 3 hours. All emergency fittings should be tested according to BS5266. This requires a monthly functional test and an annual full discharge test of 3 hours. To automate this function you can specify STM3 on many of our product ranges. Such fittings will carry out their own test regime according to BS5266 and will indicate their test status via a bi-colour indicator LED. See below for a list of fittings on which STM3 is available.

M3DA – DALI addressable emergency. Similar automated selftesting functionality as in STM3 (above) but with the additional features of interrogation and feedback via DALI from/to a central location for ease of monitoring and system management. Note that M3DA does not require or imply DALI dimming. If DALI dimming is also required, then this has to be specified separately with the initials DA, as described under dimming options, above.


If a fitting is available with a sensor ready fitted this can be specified with the following suffixes:

PIR – Passive infra-red occupancy sensing with on/off functionality

PIRD – Passive infra-red occupancy sensor with on/off and dimming functions. The driver will be DALI enabled and the sensor will communicate with the driver via a DALI control signal.

MW – Micro-wave occupancy sensor. Typically these are housed behind a diffuser or other cover and are widely used in conjunction with corridor function.

PEC – Photo electric cell. This is a simple dusk/dawn photo cell, widely used on some exterior fittings. 

PE1, PE2 etc – Miniature PE cells with a range of different lux-on and lux-off levels. 

PN1, PN2 etc – Miniature part-night PE cells that can switch a fitting on at the start of the night, off late at night when it is no longer required and on again before dawn as traffic levels increase. A range of different timing options is available. 

NS – NEMA socket fitted, ready for a PEC to be fitted at a later stage.

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