STEM与日常科技·英语30篇（7）
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Why LED Bulbs Last So Much Longer
为什么LED灯泡寿命长得多
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LED bulbs produce light through electroluminescence—electrons moving across semiconductor materials—not by heating a filament.
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Because there’s no fragile wire to burn out, they avoid the main failure mode of incandescent bulbs.
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Heat management is critical: excess heat degrades LED chips, so aluminum heat sinks draw warmth away efficiently.
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Drivers convert household AC power to stable DC current, preventing voltage spikes that shorten lifespan.
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Well-designed LEDs maintain 70% of original brightness after 25,000–50,000 hours—over 15 years of typical use.
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Frequent switching doesn’t affect them, unlike fluorescents whose electrodes wear faster with each start.
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Color consistency stays high over time thanks to phosphor coatings that convert blue light to white evenly.
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Their directional output reduces wasted light, making fixtures more efficient without reflectors or shades.
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Recycling programs now recover rare earth elements and gallium used in chip production responsibly.
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In short, solid-state physics, thermal engineering, and electronics combine to redefine lighting longevity.