I think that the photosynthesis reaction is a very efficient system. I
wonder if there is a way to see if more intense light actually helps the
plant grow better, or if just being in sunlight under any intensity
yields the same amount of work.
Normally the light intensity that the plant gets and uses is sufficient to allow its leaves to utilize 5 mg of Carbon di oxide per hour in photosynthesis. This is coupled with the amount of CO2 available as well. But at a certain point of CO2 concentration [that is 5 mg per hour], the rate of photosynthesis does not increase because of the limiting role of CO2.
Since light is one of ...