CERES aims at evaluating possible commercial applications of new protein-based down-converting red-emitting LED sources. Laboratory prototypes exhibit an extraordinary stability and efficiency as well as an easy-to-tune emission spectrum. This contrasts with the commercial low-energy emitting LED technology. CERES will focus on a validation phase including i) the optimization of the upscaling of protein production, the preparation of large-area protein-polymer color filters, and the assembly of red-emitting LED arrays and ii) the test in pre-industrial crop controlled environment agriculture growing boxes. This information will be paramount to realize a realistic market impact.