A method for optimizing the power correction to the light intensity used as a signal in an optical measurement arrangement, the steps comprising: a) providing a light source for producing a light beam; b) directing the light beam into a beam splitting device to produce a first split light beam and a second split light beam; c) directing the first split light beam through at least an interrogation area, wherein the interrogation area includes an optics cup or cuvette having a reflective coating or reflective layer and a lower tapered area to assist with the optical analysis of a sample contained within the optics cup or cuvette, the method further including directing the light generated in the sample, and emitted out of the sample (L1e), exiting the interrogation area into an optics separation device for separating the emitted light (L1e) into one or more light beams (L4, L5, L6); d) providing a detector array assembly having a plurality of detection elements (112, 114, 116, 118, 120, 122, 124, 126, 128, 130) for receiving the one or more light beams of the emitted light (L1e) and the second split light beam; e) directing the one or more light beams of the emitted light (L1e) and the second split light beam into one of the plurality of detection elements of the detector array assembly to provide information regarding the detected light of the first and second split light beams; f) measuring and assessing the information obtained in at least the detection elements (112, 114, 116, 118, 120, 122, 124, 126, 128) of the detector array assembly which received the one or more light beams of the first split light beam and the information obtained in one of the plurality of detection elements of the detector array assembly which received the second split light beam; and g) using this information obtained in step f) to adjust the power for the intensity of the light beam of the light source and/or to correct the intensity of the light beam of the light source from the interrogation area. a) providing a light source for producing a light beam; b) directing the light beam into a beam splitting device to produce a first split light beam and a second split light beam; c) directing the first split light beam through at least an interrogation area, wherein the interrogation area includes an optics cup or cuvette having a reflective coating or reflective layer and a lower tapered area to assist with the optical analysis of a sample contained within the optics cup or cuvette, the method further including directing the light generated in the sample, and emitted out of the sample (L1e), exiting the interrogation area into an optics separation device for separating the emitted light (L1e) into one or more light beams (L4, L5, L6); d) providing a detector array assembly having a plurality of detection elements (112, 114, 116, 118, 120, 122, 124, 126, 128, 130) for receiving the one or more light beams of the emitted light (L1e) and the second split light beam; e) directing the one or more light beams of the emitted light (L1e) and the second split light beam into one of the plurality of detection elements of the detector array assembly to provide information regarding the detected light of the first and second split light beams; f) measuring and assessing the information obtained in at least the detection elements (112, 114, 116, 118, 120, 122, 124, 126, 128) of the detector array assembly which received the one or more light beams of the first split light beam and the information obtained in one of the plurality of detection elements of the detector array assembly which received the second split light beam; and g) using this information obtained in step f) to adjust the power for the intensity of the light beam of the light source and/or to correct the intensity of the light beam of the light source from the interrogation area.