Jan is correct about many things, but it appears he does not understand a few ideas which ,"IF" he did , would help him much more!
He understands that Light is what provides for Energy to grow plants etc, but it appears he may not understand the connection between different Frequencies of light and Alkaline Minerals and the Electro-magnetic field which covers Earth and how this may regulate what grows or not in different areas on Earth?
I believe he would be an interesting fellow to talk to!