it is well known that the concentration of chlorophyll a is 2-3 times the concentration of chlorophyll b. this is due to the importance of chlorophyll a as the primary pigment in photosynthesis,meaning that chlorophyll a is the pigment which convert radiant energy into chemical energy.however, chlorophyll b is an accessory pigment, widen the spectrum for light absorption and transfers its light energy to chlorophyll a.