Flinging the curtains open to find sunlight flooding in is often enough to put a spring in one's step. Soon people will be able catch some sun even when it's pouring with rain, thanks to a lighting panel that uses nanoparticles to recreate something close to natural daylight. Even the dank, windowless interiors of shopping malls and underground stations could get a welcome dose of blue skies. The setup, developed by Paolo di Trapani at the University of Insubria in Como, Italy, and his colleagues, uses white LEDs as its source. The LEDs shine through a clear plastic panel studded with nanoparticles that scatter light in the same way as Earth's atmosphere does with sunlight. Different panels can simulate various outdoor light conditions--from a bright sunny day to a gorgeous sunset or even the brooding skies of a storm
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