Between three and eight PI-LED modules can be connected in series to cover 90cm – 240cm without impairment of light quality. This arrangement achieves an efficiency of 110 lm/W and at CRI>90 and its colour rendering is excellent. It has a very low colour temperature tolerance of MacAdam 3. The LINEAR SYSTEM M – ZHAGA can be operated by NeoLink wireless controls or DALI DT8 cable controls: all colour temperatures between 2,500K and 7,000K can be set precisely to any value on the Planckian locus. RGB colours and brightness can also be controlled.