The most abundant pigment in plants is chlorophyll a. Chlorophyll a primarily absorbs light with wavelengths of 430nm (blue) and 662nm (red). Because it reflects green light, we see it as green.
Phycoerythrin is a red protein-pigment complex from the light-harvesting phycobiliprotein family found in red algae and cryptophytes that functions as an accessory to the main chlorophyll pigments responsible for photosynthesis. The red pigment is due to phycoerythrobilin, a prosthetic group that gives phycoerythrin its red color.
The visible light spectrum has absorption peaks at 495 and 545/566 nm, depending on the chromophores bound and the organism under consideration. At 575 ± 10 nm, there is a strong emission peak. (Phycoerythrin absorbs light that is slightly blue-green/yellowish and emits light that is slightly orange-yellow.)
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