Abstract: An optoelectronic device is provided having a plurality of light emitters arranged to be able to illuminate an area of an environment, a CMOS based miniaturized spectrometer arranged to obtain the light spectrum of environmental light within the area of the environment, and control devices, means or methods for modifying the emission of the light emitters, based on the obtained light spectrum. Also, a system for modifying the environmental light of an area is provided, the system having at least two optoelectronic devices, and devices, means or methods to transmit information between them. Furthermore, a method for modifying the environmental light of an area, a computer program product for performing said method, a reflective device for determining the calibration of an optoelectronic device, and a method thereof.