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Consider a 60-Watt incandescent light bulb that emits a blackbody spectrum with a temperature of 2,700 K. What fraction of the power is radiated in

Consider a 60-Watt incandescent light bulb that emits a blackbody spectrum with a temperature of 2,700 K. What fraction of the power is radiated in the infrared beyond 700 nm? If you replaced the incandescent light bulb with a modern LED that emits only in the visible, how much power (in W) would you need to maintain the same level of visual brightness?

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