The Effect of Light on Photosynthesis
Plants need light energy to make the chemical energy needed to create carbohydrates. The greater the intensity of light the plant receives more light energy. The plant can photosynthesize faster as a result.
As the light intensity decreases the amount of light the plant receives is less and therefore the rate of photosynthesis decreases.
Light is a limiting factor at low light intensities. There comes a point though that any extra light energy will not increase the rate of the reaction. This is because the enzymes controlling the reaction are working as fast as possible. A this ponit light is no longer a limiting factor.
