CHARACTERIZATION OF EQUALLY CONSPICIOUS RGB SPOTLIGHTS

The Helmholtz-Kohlrausch effect is the influence of color purity on the perceived brightness of a surface. In the following are spectral characteristics of stimuli given that have proven to attract attention equally strong. The high spectral purity that colored LED sources can provide induces the perception of considerable brightness. To test conspicuity a chromatic light patch on a wall was compared to an achromatic one. Below are the profiles given for blue, green, red and purple stimuli that demonstrate equal conspicuity measures than a white spot with a luminance of 10.1 cd/m².

The chromaticity of the four chromatic stimuli and the achromatic reference is given in the CIE u’ v’ diagram. As  luminance values above also chromticity is calculated for a 10 degree observer.

The experiment and results of the study are described in the following paper:

Reisinger, M., I. Vogels, I. Heynderickx. Conspicuity of chromatic light from LED spotlights. Journal of the International Colour Association Issue 7; 2012. http://www.aic-color.org/journal/v7/jaic_v7_05.pdf