| abstract |
The invention relates to a system (10) and method for influencing a photobiological state in a vertebrate (5). The system comprises a light source (30, 32) for emitting light which influences the photobiological state, a sensor (20, 22) arranged to sense a first biophysical parameter (P1), and a control circuit (12) for controlling the light source (30, 32) so as to generate a predetermined photobiological state. The biophysical parameter represents a biological state of the vertebrate (5). The control circuit (12) receives a feedback signal (S1, S2) from the sensor (20, 22) and subsequently sends a control signal (16, 17, 18, S3) to the light source (30, 32) for controlling the light source (30, 32). The control signal is generated by combining a second parameter with the first biophysical parameter. The second parameter is a second biophysical parameter or an interaction parameter characterizing an interaction of the vertebrate with a device. The second parameter represents a further biological state of the vertebrate. The second biophysical parameter is sensed, for example, at a different time and/or is a different biophysical parameter as compared to the first biophysical parameter. |