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Proceedings Paper

Complex 3D-tailored facets for optimal lighting of facades and public places
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Paper Abstract

Due to antiquated technologies (calculation methods, regulations, lighting and luminaire concepts, production techniques) current outdoor lighting causes a lot of problems like light pollution, glare, energy waste etc. New types of luminaires, and in consequence new outdoor lighting concepts, can be created by combining advanced calculation methods for optical surfaces with recent production technologies and novel light sources such as short arc metal halide lamps. Light emitted from this small Etendue light sources can precisely be redirected by 3D-curved surfaces manufactured with injection molding, milling and aluminium metallization. The required optical design may use techniques like complex surface calculations and 3D-Tailoring. An innovative concept based on the latest findings in visual perception research is to focus the light of such short arc light sources onto a facetted secondary mirror which provides the desired illuminance distribution on a facade or a public place. These systems are designed to fulfill lighting requirements as well as providing visual comfort. Thus lamps with improved color rendering, luminous efficacy and increased lifetime are used and glare is minimized by splitting the reflector into many facets (light spot decomposition). A few examples of realized projects will be presented where such complex facetted surfaces are used to reach a special quality of light. Using novel techniques like 3D-Tailoring, each facet can be designed to individually create the desired (e.g. uniform) illuminance distribution on the target surface - in this case, a large facade. For this particular application, we chose to impose a square boundary for each facet, in order to tile the rectangular aperture of the secondary mirror without compromising efficiency.

Paper Details

Date Published: 12 November 2003
PDF: 10 pages
Proc. SPIE 5186, Design of Efficient Illumination Systems, (12 November 2003); doi: 10.1117/12.508383
Show Author Affiliations
Wilfried Pohl, Bartenbach LichtLabor GmbH (Austria)
Christian Anselm, Bartenbach LichtLabor GmbH (Austria)
Christian Knoflach, Bartenbach LichtLabor GmbH (Austria)
Andreas L. Timinger, Optics and Energy Concepts AG (Germany)
Julius A. Muschaweck, Optics and Energy Concepts AG (Germany)
Harald Ries, Optics and Energy Concepts AG (Germany)

Published in SPIE Proceedings Vol. 5186:
Design of Efficient Illumination Systems
R. John Koshel, Editor(s)

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