How long does it take to change a light bulb? The answer is 131 years. That is the amount of time that will have elapsed between when Thomas Edison first demonstrated his incandescent light bulb, and 2010, when semiconductor-based light-emitting diodes are expected to have made significant inroads into general illumination.
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Sunday, September 24, 2006
Lighting technology: The light bulb is synonymous with invention
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