Diffusing lenses, reflectors and light guides can be designed and customized for efficient color mixing requirements.
Working principle: periodic reflections fold the beam profile serveral times leading to a good homogenization via superpositions.
Additional surface textures can be introduced into optical surfaces for further color mixing.
Common techniques for surface structuring are:
Figure 2: Influence of a micro structure sphere radius on the light distribution of a stage lighting fixture using RGBW multi-color LED source and a structured light guide.
Figure 3: Micro structured glass surface of a light guide
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