The blue wavelength of the spectrum is absorbed maximum for the photosynthesis process. 

There are two main types of chlorophyll pigments in plants – chlorophyll a and chlorophyll b. Chlorophyll a is the pigment that is involved in oxygenic photosynthesis. This pigment absorbs its maximum energy from blue wavelengths. 

Chlorophyll can absorb red wavelengths as well, but because blue light has a higher frequency and more energy in one photon compared to red light, blue light is the absorbed maximum for the photosynthesis process.