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They're having us on a bit.
Seriously, though, there are a couple of hotspots in the spectrum, one blue and one red, that are important to photosynthesis and are used to compute measures (IIRC) such as PAR.
I'm not convinced we know everything there is to know about the specral response of plants. That's why I prefer to mix bulbs as well make sure I have the identified ranges covered. A more complete (i.e., sun-like) spectrum seems to appeal to my thinking.
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