"All of the energy that the plants pull from the light is already used..."
hehehe,
reminds me of a lady that called the office when i worked and asked about the dam and the electricity made from the water passing thru the turbines...anyway, she wanted to know why we didn't take the water from the low side of the dam, after the electricity has been removed from it as it just seems safer...LOL

anyway, light doesn't work like that.