The invention relates to a demonstrator (1) for simulating daylight, which is characterized by an illumination device (3) comprising at least a first plurality of lighting elements (3.1) which emit light having a first wavelength in a first spectral range, and at least a second plurality of lighting elements (3.2) which emit light having a second wavelength in a second spectral range, the first wavelength being shorter than the second wavelength, and further comprising a control device (5) for controlling the first and/or second plurality of lighting elements (3.1； 3.2) as a function of a day-specific light color and light intensity.
