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A comment on Has the world become less colourful?. Parent comment
The junction usually emits violet, but some blue ones exist too.
It's wasteful to emit UV. Fluorescent lights do it because it's not practical to tune them into visible light, but leds do not share that problem.
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The junction usually emits violet, but some blue ones exist too.
It's wasteful to emit UV. Fluorescent lights do it because it's not practical to tune them into visible light, but leds do not share that problem.