Identifying phycobiliprotein based on wavelength
Its maximum wavelength is 620.6 (nm)


I'm afraid that this is pretty much a link-only answer, but based on   Spectroscopic Properties of C-Phycocyanin and of Its $\alpha$ and $\beta$ Subunits, published in J. Biol. Chem., 1973, 248, 5679-5685 (PDF) there's a good chance that the phycobiliprotein is C-Phycocyanin.