Sorry for my english, I don't know to speak and to write in english. But I can to read, then you can to answer that I know to understand.
Plants get their energy for food by the process of photosynthesis.
Since leaves depend on photosynthesis and since the blue light is needed, then a plant would die without using the blue light. Sometimes leaves are red, but underneath the red there is green. And you write nicely in English. And they are green due to the presence of a green pigment named chlorophyll. All free energy consumed by biological systems arises from solar energy that is trapped by the process of photosynthesis.