NIST requires a multichannel, multispectral photodetector system to integrate into its Serial Flow Cytometer for hyperspectral fluorescence measurements of flowing micro and nanoparticles. The system must enable sensitive, dynamic measurements of cells, gene therapy nanoparticles, and calibration particles. It requires compatible optical connections and voltage signal routing to NIST recording devices. No budget amounts or performance location are specified. No non-bid or submission timelines are provided.