Like I said in my earlier post....I pretty much agree with most of what has been said by "Newt" in regards to lighting spectrum, photosynthesis, etc. I have been growing aquarium plants for over 20 years now so I really don't need a lecture on what plants need in order to grow.
I'm not saying that Mr. Amano is right or wrong. However, if you read his quote carefully you'll see that he is in no way talking about making the plants look more natural. He's talking about how very little sunlight (1-3%) reaches the forest floor and that as this light is filtered through the forest's green canopy and reflected as incidental light its natural wavelengths are dramatically altered. He also says that aquatic plants have evolved millions of years to adapt to greenish light available to them. The NA-Lamp adopts a fresh green ulothrix fluorescent to reproduce nature's green irradiance wavelength in your aquarium.
Because I actually read and understood Amano's quote I thought about it and it kind of makes sense. I would make one change and say that this might apply more to lower light forest plants (Cryptocorynes, Bolbitis, Microsorum species, Anubias, etc.) and not so much higher light plants. There are many different kinds of plants with all different kinds of requirements. If some plants like high intensity light while others don't why is it not possible that some plants could appreciate 'green light'? I think after reading the quote it's pretty clear that Amano designed his bulbs to grow plants and not for aesthetics like you mentioned.
Personally I think that sometimes "Amano" is overhyped but I must say that it does seem like he has put a lot of thought into his products and they seem to work quite well. In some ways his books as well as his products have created a kind of aquatic plant renaissance. I think it would be foolish to quickly pass judgement and assume that Amano's theories on aquatic plant lighting are totally wrong.
Now maybe this quote is outdated and Amano has changed his stance and is no longer making these bulbs because they suck. Or maybe this quote was taken out of context and so it is misleading. All I know is that the quote that Aen provided seems to make sense....although it is counter to the conventional view of aquarium lighting. And if Amano says it works that has to be at least as good as 'defdac' saying it doesn't.
So I guess my point is although Amano's bulb goes against what I thought was proper aquarium plant lighting I'm going to go out on a limb and say that it probably works just fine.