TY - GEN
T1 - Perception of Human Skin in Street Lighting under Five Types of Led Spectra
AU - Fontoynont, Marc
AU - Bruyère, Lucie
AU - Blanc-Gonnet, Joachim
PY - 2013
Y1 - 2013
N2 - A panel of observers has been invited to rate and compare the quality of 5 spectra of LED sources used for street lighting, on 30 subjects. Vertical illuminance on faces was 14 lx (+/- 3 lx) . All 30 subjects did not have the same type of skin. 60% were from the European Caucasian type (clear skin), 23 % from the Asian one, 17% were from the Sub-Saharan type (dark skin). All subjects were also acting as observers. Correlated Colour temperature of sources was 2200K , 2700K, 3200K, 4000K, 4800K. This was obtained by mixing cool-white, warm-white and red LEDs (for the 2200 K and 2700 K sources only). The xtreme stimuli (2200K and 4800K) were rejected by all participants. When presented in pairs (Thurstone protocole), 75% of observers preferred the 3200K stimulus, 61% the 4000 K stimulus, 59% preferred the 2700K stimulus. People with Asian skin was found to be preferred under CCT of 3200 K and below, for Sub-saharan skin type it was 3200K and above, and for Caucasian around 3200 K.
AB - A panel of observers has been invited to rate and compare the quality of 5 spectra of LED sources used for street lighting, on 30 subjects. Vertical illuminance on faces was 14 lx (+/- 3 lx) . All 30 subjects did not have the same type of skin. 60% were from the European Caucasian type (clear skin), 23 % from the Asian one, 17% were from the Sub-Saharan type (dark skin). All subjects were also acting as observers. Correlated Colour temperature of sources was 2200K , 2700K, 3200K, 4000K, 4800K. This was obtained by mixing cool-white, warm-white and red LEDs (for the 2200 K and 2700 K sources only). The xtreme stimuli (2200K and 4800K) were rejected by all participants. When presented in pairs (Thurstone protocole), 75% of observers preferred the 3200K stimulus, 61% the 4000 K stimulus, 59% preferred the 2700K stimulus. People with Asian skin was found to be preferred under CCT of 3200 K and below, for Sub-saharan skin type it was 3200K and above, and for Caucasian around 3200 K.
M3 - Article in proceeding
T3 - C I E. Publication
BT - Proceedings of CIE Centenary Conference "Towards a New Century of Light"
PB - CIE
T2 - Towards a new century of light
Y2 - 12 April 2013 through 19 April 2013
ER -