In rereading the above, I should connect the dots. Both the algae suspended in the soft tissues mentioned above, and most plants we would put in our grow beds need very similar light, based on what I am reading/have read. Both require the right types of colors, and intensity to complete photosynthesis at peak production. So low light, or wrong light will eventually lead to stress and then death. But also there's a certain point where simply adding more light, even if the right kind is pointless as their growth has a max output of production, and therefore is wasted resources. I am still working on where that point is. In my work/projects I am finding this is different, either due to the bulbs aging and not producing as intensely, shortening wave lengths, etc. Or different due to the type of plant, or stage of growth it's in...I just don't know all the details yet.