Spectrophotometer arrangement with multi-detector readhead

A spectrophotometer arrangement, comprising:

• a biological test sample containing unknown concentrations of preselected color-developed analytes having different characteristic absorption bands;
• an artificial light source for illuminating the biological test sample;
• and
• a detector assembly for detecting light from the biological test sample, said detector assembly including a plurality of light-emitting diodes having spectral responses encompassing respective ones of the different characteristic absorption bands of the preselected color-developed analytes, said plurality of light-emitting diodes including a pair of light-emitting diodes having respective spectral responses in different portions of the visible light spectrum such that said respective spectral responses are substantially non-overlapping;
• wherein said detector assembly includes a housing for enclosing and supporting said plurality of light-emitting diodes and wherein said housing includes a base and said plurality of light-emitting diodes are mounted to said base, and wherein said housing includes a window disposed opposite said base and a side wall bridging said base and said window such that said plurality of light-emitting diodes are enclosed within said housing;
• and
• wherein said plurality of light-emitting diodes are disposed at a scattering angle of approximately 45 degrees as measured between a line representing a direction of travel of light from said artificial light source to the test sample and a line representing a direction of travel of the reflected light portion from the test sample to said plurality of light-emitting diodes.