STEM与日常科技·英语30篇（2）
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Why LEDs Use Less Power Than Incandescent Bulbs
为什么LED灯比白炽灯更省电
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LEDs produce light through electroluminescence, where electrons release photons directly in a semiconductor.
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White incandescent bulbs heat a tungsten filament until it glows, wasting over ninety percent as heat.
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Because LEDs avoid thermal radiation, they convert nearly ninety percent of energy into visible light.
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A typical LED uses only eight watts to match the brightness of a sixty-watt incandescent bulb.
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Their solid-state design lacks fragile filaments, making them far more durable and efficient.
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Heat sinks manage the small amount of waste heat LEDs do generate near the chip.
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Unlike older bulbs, LEDs dim smoothly without changing color temperature or efficiency.
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They last twenty-five times longer, reducing both energy use and replacement frequency.
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Even in cold environments, LEDs start instantly and maintain full output without power surges.
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This fundamental physics difference explains why cities worldwide are switching streetlights to LED arrays.