sorry to disagree with you guys, but i feel there is a lot of things wrong with this post.
first off, the majority of the text is plagarized. show some credit to the author from who this text was copied! the author clearly has not written this themselves, it came almost directly out of a chapter in a book about light in a plant physiology text book. so, its not really new, or thier ideas.
secondly, considering the quantity of text that has been plagarized, the authors opinions make up a fraction of the text written, and is simply speculative, with no data to back up thier claims.
while it may be "interesting", it seems that it primarily summarizes some of the better known facts about plants and how they use light, while not clearly making any significant contributions to what hobbyists, or botanists already now about plants and algae.
and lastly, some of the conclusions the author makes about cultural methods to prevent algae growth are questionable at best. id like to see more evidence, more real life experiences, than a lot of mumbo-jumbo about PAR, and optimum spectral distributions to try and convince me this author has any idea what any of that really means as it relates to "optimal plant growth".