14 September 2007 Psychophysical evaluations of various color rendering from LED-based architectural lighting
Author Affiliations +
This paper reports a study on visual evaluation of colors under LED lighting operated by an energy-saving control strategy. Digitally controlled LED systems can produce various qualities of light, adjustable to users' requirements. In this context, a novel control concept inspired this research: strategic control of Red, Yellow, Green & Blue LEDs forming white light can further increase energy efficiency. The resulting (more efficient) light, however, would have decreased "color rendering" (ability of accurately reproduce colors). The notable point is that while reducing color rendering, color temperature and light levels can stay constant and hence the appearance of the modified light could stay the same, and only the colors of illuminated objects would change. But how spaces would be perceived under such light with changing color rendering is a key question. This research investigated the hypothesis that a significant range of color distortions would be unnoticeable under such dynamically controlled illumination, especially outside of users' main field of view. If successful, such control technique could be implemented for unoccupied spaces that would not tolerated dimming, and minimize peak hours energy waste, potentially enabling significant power reductions. Three incremental series of experiments were performed based on subjective assessment of colors under changing color rendering. Tests were carried out for central and peripheral vision, using laboratory booths (phase 1) and full scale architectural mockups (phase 2). Results confirmed the fundamental hypothesis, showing that the majority of subjects did not detect the color changes in their periphery while the same color changes were noticeable with direct observation.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Maria Thompson, Maria Thompson, Una-May O’Reilly, Una-May O’Reilly, Robert Levin, Robert Levin, } "Psychophysical evaluations of various color rendering from LED-based architectural lighting", Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 66690Y (14 September 2007); doi: 10.1117/12.746759; https://doi.org/10.1117/12.746759


Real time compensation of in aging effects in solid state...
Proceedings of SPIE (September 17 2014)
LED luminaire longevity strategy models comparison
Proceedings of SPIE (August 18 2010)
Human preference in tunable solid state lighting
Proceedings of SPIE (February 09 2011)
A quantitative dimming method for LED based on PWM
Proceedings of SPIE (October 14 2012)
A massive primary approach to solid state lighting
Proceedings of SPIE (October 19 2004)
The cinema LED lighting system design based on SCM
Proceedings of SPIE (November 15 2010)
Color-consistent LED modules for general lighting
Proceedings of SPIE (February 03 2009)

Back to Top