Proceedings of the 27th Session of the CIE South-Africa 2011 pages:526-533
Quadriennial Session of the CIE edition:27th location:South-Africa date:10-15 july 2011
Workshop 5 (161)
Simulated and real tri- and tetrachromatic Light-Emitting-Diode (LED) clusters were optimized for
luminous efficacy of radiation (LER) and the memory colour quality metric developed by the authors.
The simulated clusters and real clusters (composed of commercially available LEDs), respectively
showed no significant and substantial differences between the different cluster types investigated. The
real clusters also exhibited a large drop in LER and colour quality compared to the simulated clusters
due to the limited range of available peak wavelengths and spectral halfwidths. A real tetrachromatic
LED lamp, constructed with commercial red, green, blue and warm white LEDs, was optimized for
LER and colour quality. In a psychophysical experiment, the colour quality of the LED lamp (optimized
for 2700 K) and an incandescent lamp was assessed by 18 observers. The visual appreciation (in
terms of attractiveness, preference and memory colour similarity) of the LED lamp was rated
significantly higher than the incandescent lamp.