Blue and red are the biggest drivers for photosynthesis, but other wavelengths have effects on the plants as well. For example, far red light (infrared) has a huge influence on flowering and stem elongation in many plants. They really rely on light for a lot of cues for regulation.
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Love Chat Pile! Actually saw them on Saturday night in Chattanooga, on their new tour with Portrayal of Guilt. They always put on a fantastic show.