Mei's lost sandal:: What would account for the difference between the Wiki claim you mention of LED's being 15% less efficient than sodium vapor and his 40% more efficient?
empath: The sodium lamps are brighter.
However, while MIT's diode puts out more than twice as much energy in photons as it's fed in electrons, it doesn't violate the conservation of energy because it appears to draw in heat energy from its surroundings instead. When it gets more than 100 percent electrically-efficient, it begins to cool down, stealing energy from its environment to convert into more photons.
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