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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 21, Iss. S4 — Jul. 1, 2013
  • pp: A642–A655

Illumination performance and energy saving of a solar fiber optic lighting system

David Lingfors and Tarja Volotinen  »View Author Affiliations

Optics Express, Vol. 21, Issue S4, pp. A642-A655 (2013)

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The illumination performance and energy savings of a solar fiber optic lighting system have been verified in a study hall - corridor interior. The system provides intensive white light with a high luminous flux of 4500 lm under 130000 lx direct sun radiation at a 10 m fiber distance from the sun-tracking light collector. The color temperature that describes the light color perceived is 5800 ± 300 K, i.e. close to the direct sunlight outside, and the color rendering index (86), that describes how well colors are rendered under the light source, is higher for the solar lights than for the supplementary fluorescent lights (77). Thus this high quality solar lighting improves the visibility of all kinds of objects compared to the fluorescent lights. Annual lighting energy savings of 19% in Uppsala, Sweden and 46% in southern Europe were estimated for a study hall interior, as well as 27% and 55% respectively in an interior illuminated 16 h per day all days of a year.

© 2013 OSA

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(250.5460) Optoelectronics : Polymer waveguides
(350.6050) Other areas of optics : Solar energy
(150.2945) Machine vision : Illumination design

ToC Category:
Illumination Design

Original Manuscript: January 24, 2013
Revised Manuscript: March 23, 2013
Manuscript Accepted: April 1, 2013
Published: May 24, 2013

David Lingfors and Tarja Volotinen, "Illumination performance and energy saving of a solar fiber optic lighting system," Opt. Express 21, A642-A655 (2013)

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