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Proceedings Paper

Novel high-performance scattering materials for use in energy-saving light fittings and skylights based on polymer pigmented with polymer
Author(s): Geoffrey B. Smith; Alan Earp; Jim B. Franklin; Geoffrey McCredie
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Paper Abstract

Simple quantitative performance criteria are developed for translucent materials in terms of hemispherical visible transmittance, and angular spread of transmitted luminance using a half angle. Criteria are linked to applications in luminaires and skylights with emphasis on maximising visible throughput while minimising glare. These basic criteria are also extended to angle of incidence changes which are substantial. Example data is provided showing that acrylic pigmented with spherical polymer particles can have total hemispherical transmittance with weak thickness dependence, which is better than clear sheet, while the spread of transmitted light is quite thickness-sensitive and occurs over wider angles than inorganic pigments. This combination means significantly fewer lamps can achieve specified lux levels with low glare, and smaller skylights can provide higher, more uniform daylight illuminance.

Paper Details

Date Published: 13 November 2001
PDF: 9 pages
Proc. SPIE 4458, Solar and Switching Materials, (13 November 2001); doi: 10.1117/12.448254
Show Author Affiliations
Geoffrey B. Smith, Univ. of Technology/Sydney (Australia)
Alan Earp, Univ. of Technology/Sydney (Australia)
Jim B. Franklin, Univ. of Technology/Sydney (Australia)
Geoffrey McCredie, Univ. of Technology/Sydney (Australia)

Published in SPIE Proceedings Vol. 4458:
Solar and Switching Materials
Carl M. Lampert; Claes-Goran Granqvist; Keith L. Lewis; Carl M. Lampert; Claes-Goeran Granqvist; Keith L. Lewis, Editor(s)

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