NIST requires a complete, multichannel and multispectral photodetector system. The system will integrate directly into NIST's Serial Flow Cytometer to perform sensitive, dynamic, and hyperspectral fluorescence measurements of rapidly flowing micro and nanoparticles including cells, gene therapy nanoparticles, and fluorescence calibration particles. Incorporation of the system within NIST instruments requires compatible connections to optical lines and routing of voltage signals to NIST recording devices.