LEDs Just Got Brighter

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800px-Verschiedene_LEDs.jpg

Light-emitting diodes, or LEDs, are four times more efficient than incandescent lights and greener than compact fluorescent bulbs (think: mercury). They also last up to 15 years before burning out.

So why aren’t they everywhere?

Because they’re expensive—created on a pricey layer of sapphire.

Until now. Purdue University researchers report a novel technique using cheap metal-coated silicon wafers to make LEDs.

Cheaper is better. Widespread LED use could cut electricity consumption by 10 percent.

That could help us heed Al Gore’s call to produce all global-warming-free electricity by 2018.

The LED findings appear this month in Applied Physics Letters, journal of the American Institute of Physics.

Julia Whitty is Mother Jones’ environmental correspondent, lecturer, and 2008 winner of the Kiriyama Prize and the John Burroughs Medal Award.

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We didn't know what to expect when we told you we needed to raise $400,000 before our fiscal year closed on June 30, and we're thrilled to report that our incredible community of readers contributed some $415,000 to help us keep charging as hard as we can during this crazy year.

You just sent an incredible message: that quality journalism doesn't have to answer to advertisers, billionaires, or hedge funds; that newsrooms can eke out an existence thanks primarily to the generosity of its readers. That's so powerful. Especially during what's been called a "media extinction event" when those looking to make a profit from the news pull back, the Mother Jones community steps in.

The months and years ahead won't be easy. Far from it. But there's no one we'd rather face the big challenges with than you, our committed and passionate readers, and our team of fearless reporters who show up every day.

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