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History of the First Lightbulb | Who Invented the Lightbulb?
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LED Lights - How it Works - History
Philips Unveils World's First LED Replacement for Most Common Bulb
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On the origin of the LED lamp – Product Evolution
Ultra efficient | Philips lighting
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The L.E.D. Quandary: Why There's No Such Thing as “Built to Last” | The New Yorker
SWITCH60 Review: The First Liquid-Cooled LED Bulb Will Light Up Your House Like Edison