Miximum photosynthesis occurs in

Maximum photosynthesis occurs in White light.
Most organisms that use oxygenic photosynthesis use visible light for the light-dependent reactions, although at least three use shortwave infrared or, more specifically, far-red radiation.
Photosynthesis range from 400 to 700 nm, and it absorbs the Violet, Blue and Red colour of Light. In white light all the colour spectrum energies are involved so, maximum photosynthesis is taken place in white light.