The practical measurement of light in plant biology is called Photosynthetically Active Radiation (PAR)

Chlorophyll is the green-colored substance in plants that along with light and carbon dioxide drives photosynthesis, the most important energy reaction on earth

No life would be possible on our planet without photosynthesis

The action spectrum for photosynthesis (CO fixation) is a fairly flat curve over practically the entire visible light spectrum (400nm to 700nm)

Also, there is very little difference in light-capturing between one green plant and another, which is not surprising, since they all contain the same photochemical apparatus

The photosynthetic efficiency of blue light is slightly less than that of red light

The practical importance of this is that; plants are never grown in monochromatic or dichromatic light, but always in light containing a full spectrum of light energy