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Proceedings Paper

Efficient color mixing through étendue conservation using freeform optics
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Paper Abstract

Today’s SSL illumination market shows a clear trend to high flux packages with higher efficiency and higher CRI, realized by means of multiple color chips and phosphors. Such light sources require the optics to provide both near- and far-field color mixing. This design problem is particularly challenging for collimated luminaries, since traditional diffusers cannot be employed without enlarging the exit aperture and reducing brightness. Furthermore, diffusers compromise the light output ratio (efficiency) of the lamps to which they are applied. A solution, based on Köhler integration, consisting of a spherical cap comprising spherical microlenses on both its interior and exterior sides was presented in 2012. The diameter of this so-called Shell-Mixer was 3 times that of the chip array footprint. A new version of the Shell-Mixer, based on the Edge Ray Principle and conservation of etendue, where neither the outer shape of the cap nor the surfaces of the lenses are constrained to spheres or 2D Cartesian ovals will be shown in this work. The new shell is freeform, only twice as large as the original chip-array and equals the original model in terms of color uniformity, brightness and efficiency.

Paper Details

Date Published: 25 August 2015
PDF: 8 pages
Proc. SPIE 9572, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XII, 95720G (25 August 2015); doi: 10.1117/12.2186965
Show Author Affiliations
Simone Sorgato, Light Prescriptions Innovators Europe, S. L. (Spain)
Vrije Univ. Brussel (Belgium)
Rubén Mohedano, Light Prescriptions Innovators Europe, S. L. (Spain)
Julio Chaves, Light Prescriptions Innovators Europe, S. L. (Spain)
Aleksandra Cvetkovic, Light Prescriptions Innovators Europe, S. L. (Spain)
Maikel Hernández, Light Prescriptions Innovators Europe, S. L. (Spain)
Pablo Benitez, Light Prescriptions Innovators, LLC (United States)
Univ. Politecnica de Madrid (Spain)
Juan C. Miñano, Light Prescriptions Innovators, LLC (United States)
Univ. Politecnica de Madrid (Spain)
Hugo Thienpont, Vrije Univ. Brussel (Belgium)
Fabian Duerr, Vrije Univ. Brussel (Belgium)


Published in SPIE Proceedings Vol. 9572:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XII
Roland Winston; Jeffrey M. Gordon, Editor(s)

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