From the three basic colors RED, GREEN and BLUE (RGB) more than 16 million individual questions can be generated through digital grading (255 levels each), the differentiated perception of which by the human eye is limited (to approx. 6 million). In our devices, the color is generated by LEDs (light-emitting diodes). With the emission of the corresponding colored light waves, a spectrochromatic light with its specific wavelength is generated.