A system for determining a colorimetric value , the system comprising: a plurality of ambient color sensors ; and a sensor control module configured to obtain a first plurality of color measurements , each color measurement obtained from a different one of the plurality of ambient color sensors at approximately a same time; characterized by a perceptual color space analysis module configured to, for each color measurement included in the first plurality of color measurements : calculate a plurality of perceptual color space coordinates for the color measurement by transforming the color measurement relative to a respective plurality of reference white points , each of the reference white points being for a different one of multiple reference light sources , calculate a plurality of distances to the reference white points , each corresponding to a different one of the plurality of perceptual color space coordinates and based on one or more components of the corresponding perceptual color space coordinate , and select the smallest of the plurality of distances as a minimum distance for the color measurement; a color sensor/measurement selection module configured to select a first set of color measurements from the first plurality of color measurements based on at least the minimum distance selected for each of the first set of color measurements being less than or equal to a threshold distance; and a color measurement fusion module configured to calculate a first colorimetric value based on the first set of color measurements. a plurality of ambient color sensors ; and a sensor control module configured to obtain a first plurality of color measurements , each color measurement obtained from a different one of the plurality of ambient color sensors at approximately a same time; characterized by a perceptual color space analysis module configured to, for each color measurement included in the first plurality of color measurements : calculate a plurality of perceptual color space coordinates for the color measurement by transforming the color measurement relative to a respective plurality of reference white points , each of the reference white points being for a different one of multiple reference light sources , calculate a plurality of distances to the reference white points , each corresponding to a different one of the plurality of perceptual color space coordinates and based on one or more components of the corresponding perceptual color space coordinate , and select the smallest of the plurality of distances as a minimum distance for the color measurement; calculate a plurality of perceptual color space coordinates for the color measurement by transforming the color measurement relative to a respective plurality of reference white points , each of the reference white points being for a different one of multiple reference light sources , calculate a plurality of distances to the reference white points , each corresponding to a different one of the plurality of perceptual color space coordinates and based on one or more components of the corresponding perceptual color space coordinate , and select the smallest of the plurality of distances as a minimum distance for the color measurement; a color sensor/measurement selection module configured to select a first set of color measurements from the first plurality of color measurements based on at least the minimum distance selected for each of the first set of color measurements being less than or equal to a threshold distance; and a color measurement fusion module configured to calculate a first colorimetric value based on the first set of color measurements. <EOS>