This is pretty remarkable. It's brighter and yet cheaper to make than traditional fluorescents. Could be a game changer if they have good longevity.
http://stream.wsj.com/story/latest-headlines/SS-2-63399/SS-2-209424/
http://www.usa.lighting.philips.com/lightcommunity/trends/tled/
“If these lights were all replaced with 200 lumen per watt LEDs, the U.S. would use around 100 terawatt less energy – saving more than $12 billion and preventing around 60 million metric tons of carbon dioxide from being released into the atmosphere.”
http://stream.wsj.com/story/latest-headlines/SS-2-63399/SS-2-209424/
http://www.usa.lighting.philips.com/lightcommunity/trends/tled/