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Proceedings Paper

Lighting quality for aluminum and prismatic light guides
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Paper Abstract

The use of high reflectance aluminum lighting guides is most frequently used material for actual natural lighting systems. Spectral Reflectance over the entire length of a light guide changes the color of the output light at the end of the guide. When light guides are made of a prismatic film, the influence of the reflectance is minimizing and absortance is not important when the sheets are thin. Color Rendering index and color temperature will be important parameters in order to evaluate Lighting quality and therefore in Museums, office buildings and production centers to get the normative approval. In this paper a theoretical simulation and 3D ray tracing for aluminum and prismatic light guides of different shapes (rectangular and cylindrical) and lengths over the entire visible spectrum are studied. Output light color temperature related to several illuminants and CRI are evaluated for the simulated aluminum and prismatic light guides. Thus, prismatic light guides seem more robust in lighting quality maintenance regardless of conditionals like angle acceptance for TIR guiding, aluminum guides are efficient and maintain light quality only for short distances.

Paper Details

Date Published: 21 September 2011
PDF: 9 pages
Proc. SPIE 8170, Illumination Optics II, 81700T (21 September 2011); doi: 10.1117/12.896814
Show Author Affiliations
Berta García-Fernández, Univ. Complutense de Madrid (Spain)
Daniel Vázquez-Molini, Univ. Complutense de Madrid (Spain)
Antonio Álvarez Fernández-Balbuena, Univ. Complutense de Madrid (Spain)

Published in SPIE Proceedings Vol. 8170:
Illumination Optics II
Tina E. Kidger; Stuart David, Editor(s)

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