Abstract: The present invention relates to a device for the non-invasive determination of physiological parameters of a test person with a lighting unit (32), having a plurality of LED types whose emission maxima are at different wavelengths from the visible to the NIR wavelength range and include an emission maximum below 590 nm, a photo sensor for application to the skin, a data processing unit (11) for reading out the photo sensor and for controlling the illumination unit (32), so that the different types of LEDs individually in a predetermined activation sequence at successive activation start times tk (k=1, 2 . . . M) are activated for a respective predetermined activation period, and to repeat the activation sequence with a clock frequency as a result n=1, 2 . . .