System and method for controlling a light source illuminating plants in a greenhouse

A method for operating a system for controlling a light source illuminating plants in a greenhouse, wherein the system comprises,

• a sensor for detecting a first spectrum of ambient light, the sensor comprises eighteen channels or eighteen sensors for detecting eighteen first spectra of the ambient light, wherein one or the eighteen sensors being configured to measure incident intensities in eighteen wavelength ranges, and
• a control unit for adjusting a second spectrum of the light source in dependency of the measured incident intensities in the eighteen wavelength ranges,
• wherein in a measuring step, the sensor detects incident intensities in at least two wavelength ranges, and in an adjustment step, the second spectrum of the light source is adjusted in dependency of the measured incident intensities in the eighteen wavelength ranges, and
• wherein spectral distributions of the eighteen intensities are arranged in an overlapping manner, wherein the control unit is configured to normalize the measured incident intensities.