Night sky to turn bluer?

The night sky may glow bluer as yellow-orange streetlights are gradually replaced by whiter, energy-saving lights, a new study says.

Light-emitting diodes, or LEDs, cast a bluish glow in the sky and are about 20 percent more efficient than industry-standard streetlamps, which generate red-colored light pollution.

With LED efficiency expected to double to 40 percent in a few years, it's inevitable that governments worldwide will opt to save energy by switching to LEDs, which also last longer and require less maintenance, experts say.

Yet it's uncertain how much the color of light pollution will change as LEDs take over, experts say. Also unknown are effects of...

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