Perception of Human Skin in Street Lighting under Five Types of Led Spectra

Marc Fontoynont, Lucie Bruyère, Joachim Blanc-Gonnet

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review


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.
Original languageEnglish
Title of host publicationProceedings of CIE Centenary Conference "Towards a New Century of Light"
Number of pages7
Publication date2013
ISBN (Electronic)978-3-902842-44-2
Publication statusPublished - 2013
EventTowards a new century of light - Paris, France
Duration: 12 Apr 201319 Apr 2013


ConferenceTowards a new century of light
SeriesC I E. Publication
VolumeCIE x038:2013 (including Addendum 1)

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