Magazine LICHT 04/2019: Magical Light - Fabrication and Application of Tertiary Optics  LED lighting is inseparably connected to Optics and Lenses, such as primary, secondary and tertiary optics. With tertiary optics, in special, versatile light scenarios can be conjured. The German magazine 'LICHT' illustrates the latest developments concerning the application and manufacturing of tertiary optics. [...]