A spectrometer system comprising, a composite external light source in optical communication with, and in optical sequence with, a source light collector ; an illumination light structuring component for transforming the collected light into a spatial light distribution that is optimal for sample illumination; a sample holder ; a sample light collector ; a spectrometer light structuring component for producing a spatial light distribution that is optimal for the performance of a light dispersing engine; a light dispersing engine ; sample illumination, measurement, monitoring and calibration channels for guiding light from the composite external light source and onto the spectrometer light structuring component at an entrance to the light dispersing engine ; one or more photo detectors ; an electrical signal converter , the electrical signal convertor in communication with a data preprocessing unit and a data analyzer , the electrical signal converter for converting the signal obtained from the one or more photo detectors into an electric signal, the data preprocessing unit or the data analyzer comprising a correction photo detector algorithm in communication with an output of the one or more photo detectors , a sample illumination correction algorithm in communication with an output of the sample illumination, measurement, monitoring and calibration channels, or a combination thereof, three or more narrow bands of light for monitoring and correcting for an orientation of the one or more photo detectors , and producing a light dispersing engine - photo detector (LDE-PD) alignment procedure; and three or more narrow bands of light for monitoring and correcting for an orientation of the spectrometer light structuring component , and producing a spectrometer light structuring component - light dispersing engine (SLSC-LDE) alignment procedure. a composite external light source in optical communication with, and in optical sequence with, a source light collector ; an illumination light structuring component for transforming the collected light into a spatial light distribution that is optimal for sample illumination; a sample holder ; a sample light collector ; a spectrometer light structuring component for producing a spatial light distribution that is optimal for the performance of a light dispersing engine; a light dispersing engine ; sample illumination, measurement, monitoring and calibration channels for guiding light from the composite external light source and onto the spectrometer light structuring component at an entrance to the light dispersing engine ; one or more photo detectors ; an electrical signal converter , the electrical signal convertor in communication with a data preprocessing unit and a data analyzer , the electrical signal converter for converting the signal obtained from the one or more photo detectors into an electric signal, the data preprocessing unit or the data analyzer comprising a correction photo detector algorithm in communication with an output of the one or more photo detectors , a sample illumination correction algorithm in communication with an output of the sample illumination, measurement, monitoring and calibration channels, or a combination thereof, three or more narrow bands of light for monitoring and correcting for an orientation of the one or more photo detectors , and producing a light dispersing engine - photo detector (LDE-PD) alignment procedure; and three or more narrow bands of light for monitoring and correcting for an orientation of the spectrometer light structuring component , and producing a spectrometer light structuring component - light dispersing engine (SLSC-LDE) alignment procedure. <EOS>