Yet another brilliant dead end

IEEE Spectrum: Beyond Blue:

If this stuff works (how many times have I said that before) It could be way, way cool. Suddenly the efficiency of nice-looking light sources goes up from 2-3% to 30+%.  One complicating factor is that LEDs still like to be relatively small and consume about 20-30 mW in a single package, leading to really ugly arrays that try to fit into normal bulb spaces. It might be more interesting (even though the efficiency gains are less) to think what would happen if you made an LED bulb that fit into the space currently occupied by a fluorescent tube.)

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