Color Experiments with Modern Sources of Illumination

In chromaticity contrast experiments complementary colors were applied. When the surrounding field was blue, fluorescent illumination (FL) strengthened contrast induced on a surrounded yellow field. A red surrounding field yielded strongest contrast effect under incandescent light (IL). The perimetric thresholds of all colors were increased when changing from IL to FL, i.e., they could be recognized further out in the periphery. The rise was strongest for blue.