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Specification language

How to specify your projects regarding dimming, flicker and DALI?

In spaces where really low light levels are important, it's vital to have the right LED driver at the heart of your lighting application. The amazing ability of the human eye to adapt to light means that the way we perceive light levels is very non-linear. Even if you dim a light down to just 1% power, you'll still perceive 10% of the full light level. Really low levels require deeper dimming, not just to 1% but to as low as 0.1% - what we refer to as dim-to-dark.


Our specification advice:

Dimming requirement is to dim to 0.1% or dim-to-dark.

LED drivers that do not meet this 0.1% dimming levels will not be considered.


Flicker can be the cause of an entire array of performance and health effects, ranging from eye strain to serious neurological problems such as epileptic seizures. Even when flicker is too fast for the human eye to see, it can still have an effect. The P1789 recommendation on flicker from the IEEE Standards Association, and the diagram associated with it, are great tools for assessing the flicker performance of different drivers.


Our specification advice:

LED drivers shall conform to IEEE P1789 standards.

Alternatively, manufacturers must demonstrate conformance with product literature and testing which demonstrates this performance. Submit % flicker in 1% increments for full range of dimming, starting at 500 mA for full output reading.

Systems that do not meet IEEE P1789 will not be considered.


DALI lighting controls
The Digital Addressable Lighting Interface (DALI) is an international standard for network-based lighting control systems, specified by technical standards IEC 62386 and IEC 60929. The idea is that all DALI-compliant products are interoperable with each other.

Compliant products can be recognised by the DALI logo.

The underlying DALI technology was established by a consortium of lighting equipment manufacturers as a successor to 0-10V lighting control systems, and as an open alternative to the Digital Signal Interface (DSI), on which DALI is based. The most recent version, DALI-2, was introduced in 2015.

If DALI-based control and interoperability with other DALI equipment is required, we recommend products that comply with the technical standards IEC 62386 and IEC 60929.

Our specification advise:

Products must be DALI-certified and comply with the technical standards IEC 62386 and IEC 60929.


Wireless lighting controls

Luminaire components: LED driver with a separate fixture integrated Bluetooth Low Energy 4.2 (or higher) (BLE) radio, powered from and in digital communication with an intelligent LED driver. Power and data communication is through a 2 wire connection. BLE radio shall provide a wireless control network to the fixtures, in lieu of base low voltage control wire, and provide a wireless network to the fixtures for override switch, photocell and occupancy sensor control functions as specified. In addition, BLE shall provide a positioning beacon signal compatible with Apple iOS and Android mobile phones for use with mobile software.


Visit our learning center for helpful white papers on dimming curves, flicker and more.