CIE whiteness assessment of papers : impact of LED illumination

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Proceedings titleProceedings of the 27th Session of the CIE Sun City, South Africa, 9 - 16 July 2011
Series titleCIE; no. 197
Conference27th Session of the CIE, 10-15 July 2011, Sun City, South Africa
Pages323330; # of pages: 8
SubjectCIE Whiteness, Fluorescence, White LED, Total Radiance Factor, Fluorescent Whitening Agent (FWA), Colour Rendering Index (CRI)
AbstractWhite LED sources have been developed as replacements for various indoor lighting systems. The impact of this LED illumination for various colorimetric applications has been generally considered in terms of its colour rendering index (CRI). However, for certain applications, such as the whiteness assessment of papers, this performance metric is insufficient since it only considers the spectral power distribution (SPD) in the visible range. To improve the appearance and commercial value of white paper, papermakers often use fluorescent whitening agents (FWAs) which absorb in the near-UV and emit in the blue region. The shape and intensity of this added fluorescent light depend critically on the SPD of the irradiating source in both the UV and visible wavelength regions. This paper discusses the impact of these white LED sources for whiteness assessment of a representative fluorescent white paper sample by comparing the calculated total radiance factors and CIE whiteness with results provided under CIE and ISO reference illumination conditions.
Publication date
AffiliationNRC Institute for National Measurement Standards; National Research Council Canada
Peer reviewedYes
NPARC number18560945
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Record identifier618b823f-7f8d-4c9e-b9cb-2d810ae8886f
Record created2012-03-09
Record modified2016-05-09
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