lol
well... You would only be reducing overall light of all spectrum's and reducing certain colors more than others.
The plant, as with all life, evolved to grow under certain conditions. Humans have forced their own selective evolution of the plant to make it better in various ways. You can improve those conditions by increasing good things, decreasing bad things and get better results. It's hard to see how this could be an improvement in any way as you would be reducing good things.
Perhaps using bulbs that put out certain colors more than others would be better but then again that's pretty much what everyone does....