Colour-control options added to certification program

Additional methods to control the colour output of light sources have been added to the DALI-2 certification program, operated by the DALI Alliance. The certification is created on open, international standards and is focused on device interoperability, backed by independent verification of test results.

This leading globally-standardised protocol for digital lighting control allows several alternative methods – known as colour types – that can be utilised to control the colour output of LEDs and other light sources.

The organisation has added DALI-2 tests for LED drivers and other control gear that employ two colour types, known as RGBWAF and xy. These options are now offered alongside colour type Tc (widely known as tunable white).

Colour type RGBWAF enables simple control of up to six individual channels of colour (red, green, blue, white, amber and free colour). For more sophisticated control, colour type xy enables precise and repeatable selection of the colour coordinates from the CIE colour space chromaticity diagram. Colour type Tc provides control of the correlated colour temperature (CCT) along the black-body line, from warm white to cool white. Colour types Tc and xy enable calibration of the light-source and control-gear combination, allowing higher colour accuracy.

“The combination of colour control and the standardised DALI dimming curve provides a powerful tool for lighting designers and other users. DALI scenes allow recall and smooth fading of colour as well as brightness,” says Paul Drosihn, general manager, DALI Alliance. “The new options for colour control are an important addition to the DALI-2 program and strengthen market confidence in the interoperable behaviour of DALI lighting-control devices.”