This is pretty neat- using red LEDS to grow lettuce is 60% more efficient than fluorescent light when growing vegetables hydroponically. The red LED technology produces 7000 heads of lettuce per day all year round in a 10-floor building on just 1000 square meters of space. The lettuce matures more than three times as fast under the LEDs than outdoors. The Metaefficient site also has a lot of other interesting products that are just, better. Maybe when we’re all done with our POV projects we’ll grow plants.
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If you plot light absorbtion of the different pigments contained in a leaf in function of the wavelength, you get two peaks. One at around 425 nm and another one around 675 nm (altough the first peak is much broader). In fact, from 400 nm – 460 nm you almost have peak absorption.
Now with this information, they could achieve better productivity from the plants if they used ultraviolet LEDs. But the cost of such LEDs is much higher than red LEDs.
This is a great way to reduce the energy consumption of hydroponic facilities.