Spectral Variation of Energy-Efficient Room Lighting

  • Helmut F. O. MüllerEmail author
Conference paper


This research concentrates on advanced lighting systems with increased energy efficiency and improved color effects in relation to human-centric lighting (HCL). HCL includes the visual aspects of color perception like color temperature of light, color rendering, and, last but not least, the aesthetic image of room illumination. In addition, nonvisual effects on the circadian biorhythm, for example, influencing the melatonin hormone level, must be taken into account. Light-emitting diodes (LEDs) have the potential to meet the aforementioned demands of energy efficiency and spectral adaptation if innovative solutions (in contrast to retrofit solutions) are applied. Lighting principles and innovative luminaires are developed for typical office rooms, which allow for variable color temperatures (tunable white) and illuminances, high color rendering indices, decorative and harmonic color compositions, and circadian lighting. Various situations of room illumination are visualized. A prototype luminaire is demonstrated, and characteristics of lighting performance and energy efficiency are given.


LED lighting Tunable white Color image Circadian effect Luminaire Room illumination 


  1. 1.
    Khanh TQ, Bodrogi P, Vinh QT, Winkler H (2015) LED lighting, technology and perception. Wiley, WeinheimGoogle Scholar
  2. 2.
    LiTG Deutsche Lichttechnische Gesellschaft e.V (2015) Farbqualität: Definition und Anwendungen, Berlin, info@litg.deGoogle Scholar
  3. 3.
    DIN SPEC 67600 (2013) Biologically effective illumination—design guidelines. Beuth, BerlinGoogle Scholar
  4. 4.
    Rae MS, Figuera MG, Biermann A, Bullough JD (2010) Circadian light. J Circadian Rhythms 8(2):1–10Google Scholar
  5. 5.
    CIE 13.3 (1995) Method of measuring and specifying colour rendering properties of light sources. CIE Central-Bureau, Paris. CIE Publ. 13.2 (2nd edn. corrected reprint), 1974Google Scholar
  6. 6.
    Smet KAG, Schanda J, Whitehead L, Luo MR (2013) CRI2012: a proposal for updating the CIE color rendering index. Light Res Technol 45:689–709CrossRefGoogle Scholar
  7. 7.
    Khanh TQ, Trinh VQ (2015) LED-systeme mit variablen Spektren. Licht 1-2/2015: 72–78Google Scholar
  8. 8.
    Mueller HFO, Sasso F (2014) Energy-efficient lighting by LED. In: Proceedings of WREC XIII, Kingston, 3–8 Aug 2014Google Scholar
  9. 9.
    Tengler F-C, Jakubowski M, Neyer A (2013) High transparent light guiding plate for single-sided light emission. Poster Abstract, (Micro and Nano Engineering) MNE 2013, LondonGoogle Scholar
  10. 10.
    Deutsche Lichttechnische Gesellschaft e.V., LiTG (1015) Farbqualität: definition und Anwendungen, Berlin, March 2015Google Scholar
  11. 11.
    Ou L, Chong P, Lou MR, Minchew C (2011) Additivity of colour harmony. Color Res Appl 36(5):355–372CrossRefGoogle Scholar
  12. 12.
    Szabo F, Bodrogi P, Schanda J (2010) Experimental modeling of color harmony. Color Res Appl 35(1):34–48CrossRefGoogle Scholar

Copyright information

© Springer International Publishing Switzerland 2017

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 2.5 International License (, which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

The images or other third party material in this chapter are included in the chapter's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the chapter's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.

Authors and Affiliations

  1. 1.Green Building R&D GmbHDüsseldorfGermany

Personalised recommendations