Abstract: A method and a multispectral color coordination system simulates high-quality daylight spectra. Light is produced with LEDs disposed in groups. Each group emits light at different wavelengths within the daylight spectrum. The wavelength of the light emitted by each LED at different working temperatures and different PWM values is measured. The measurement results for each LED are stored in memory, with assignment to working temperatures and PWM values. The LEDs are actuated at values selected from the memory content, as a function of the light to be emitted by each group. The working temperature of each individual LED chip is constantly measured and compared with the values stored in memory with regard to the current working temperature, and, in case of deviation compensated for by recalculating the spectrum, taking into consideration the PWM values stored in memory for the working temperature, and actuating with these.

Abstract: A method and a multispectral color coordination system simulates high-quality daylight spectra. Light is produced with disposed in groups. Each group emits light at different wavelengths within the daylight spectrum. The wavelength of the light emitted by each LED at different working temperatures and different PWM values is measured. The measurement results for each LED are stored in memory, with assignment to working temperatures and PWM values. The LEDs are actuated at values selected from the memory content, as a function of the light to be emitted by each group. The working temperature of each individual LED chip is constantly measured and compared with the values stored in memory with regard to the current working temperature, and, in case of deviation compensated for by recalculating the spectrum, taking into consideration the PWM values stored in memory for the working temperature, and actuating with these.

Abstract: A method for calibration is controlled using measurement technology of at least one device unit of a device system which includes a monitor for image processing and a standard light device. The monitor is calibrated, and the luminance is measured at the calibrated monitor and at a standard light device. The actual value of the luminance at the standard light device is compared with the value for the luminance of the monitor. If there is a difference, the standard light device receives a control signal to change the brightness or the contrast. This regulation is continued until no difference exists between the measured actual value at the standard light device and the reference value stored in the memory of the evaluation unit.