Introduction

IEC 62386-209 describes DALI control gears for color or color temperature control.

Representation of the color temperature

The black-body line (BBL) or Planck curve runs within the CIE standard color chart, which represents the possible color space. Values on this curve correspond to a white hue specified in Kelvin. The higher the value, the colder the light is perceived.

Light sources from this range combine LEDs of different color temperatures on one board. This allows the lighting effect of, for example, Human Centric Lighting (HCL) to be adjusted throughout the day. It may be necessary to use different color temperatures for the presentation of different goods (e.g. food, colorful or bright backgrounds).

Mirek and Kelvin

In IEC 62386, the Mirek unit is used to specify the color temperature T_C. The function blocks of the Tc3_DALI library also use this unit. The color temperature values can be converted using the functions KELVIN_TO_MIREK and MIREK_TO_KELVIN.