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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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To me, that means that if deploying these in a large scale, they could have unintended consequences, as you cannot explicitly control what heat energy it draws from its environment.
On the flip side, they would probably make the ideal fridge light.