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Advances in OptoElectronics
Volume 2010 (2010), Article ID 596825, 9 pages
Research Article

Towards the Optimum Light Source Spectrum

EET School Manukau Institute of Technology, Private Bag 94-006, Manukau 2241, New Zealand

Received 23 December 2009; Revised 24 April 2010; Accepted 7 June 2010

Academic Editor: Xian Cao

Copyright © 2010 Andrew Chalmers and Snjezana Soltic. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper is concerned with designing light source spectra for optimum luminous efficacy and colour rendering. We demonstrate that it is possible to design light sources that can provide both good colour rendering and high luminous efficacy by combining the outputs of a number of narrowband spectral constituents. Also, the achievable results depend on the numbers and wavelengths of the different spectral bands utilized in the mixture. Practical realization of these concepts has been demonstrated in this pilot study which combines a number of simulations with tests using real LEDs (light emitting diodes). Such sources are capable of providing highly efficient lighting systems with good energy conservation potential. Further research is underway to investigate the practicalities of our proposals in relation to large-scale light source production.