The ratio of red and blue light controls various functions of a plant. In the context of aquarium plants, more red light makes them get tall and leggy, more blue light makes them be compact and bushy.

https://gpnmag.com/article/effects-of-blue-light-on-plants/ talks a bit about it in the context of greenhouses and tomatoes, the picture in the middle shows 6 plants grown with wildly different red/blue ratios.

If the balance of the light coming through your solar panel was problematic, you could always filter out some of the overabundant light.