rejecting green light
Wednesday, February 22 2012
Last night for the first time I used a special LED array designed for growing plants to help illuminate some of my seedlings in the four hours before dawn. The array consists mostly of red LEDs with some blue ones sprinkled in, thus generating what looks like a spectrum consisting of everything except green. When pointed at a plant, it looks black, meaning it is absorbing all of that light and reflecting almost nothing. Why did chloroplasts evolve to reject green light? It seems like a waste of perfectly good light directly in the middle of what we think of as the visible spectrum.
Just those four extra hours of light seemed to perk up the couple plants exposed to it. It's just a two watt bulb, so I can only use it for a few seedlings at a time.
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