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From technabob:
This huge LED screen displays mesmerizing patterns of light and video to passersby. But the really amazing thing about the enormous wall of light is that it's completely self-sustaining. That is, the light panels themselves harness the energy of the sun during the day to power a colorful light show at night.
GreenPix - Zero Energy Media Wall uses thousands solar photovoltaic capture cells attached to a grid of glass panels, each of which conceals an array of computer-controlled LEDs.
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