LEDs experiments in Paris 1. Colour rendering 2. Kruithof’s rule. F. Viénot, E. Mahler, A. Rambaud, M.-L. Durand, C. Boust, J.-J. Ezrati, CRCC, Muséum national d’histoire naturelle CIE, TC1-69, Stockholm, June 2008. Colour rendering - Illumination. WWARGB. WR. RGBA. RGB. LED clusters
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
F. Viénot, E. Mahler, A. Rambaud, M.-L. Durand, C. Boust, J.-J. Ezrati,
CRCC, Muséum national d’histoire naturelle
CIE, TC1-69, Stockholm, June 2008
RGB LEDs “RGB”
RGB+Amber LEDs “RGBA”
two-phosphor cold white LED + Red LED “WR”
two-phosphor cold white LED + two-phosphor warm white LED + Amber + RGB LEDs “WWARGB”
Distribution of colourfulness ratings
Distribution of hues
Solux WWRGBA RGB
Rea Mark S., Freyssinier-Nova Jean P., 2008, Color Rendering: A Tale of Two Metrics, COLOR research and application, 33: 192-202.
Kruithof, A. A.: Tubular Luminescence Lamps for General Illumination, Philips Technical Review 6, pp. 65-96 (1941).
Kruithof has examined the illuminance limits between which users find the illumination “pleasant”.
Kruithof’s diagram (Fig. 10) shows the accepted combination of illuminance and colour temperature.
The author states that, globally, a low and high illumination should correspond to a low and high colour temperature, respectively (my translation).
Illuminance (log scale)
Correlated colour temperature
low-contrast acuity (log)
Y in cd.m-2
Perceived lightness scale
Y in cd.m-2