STEM与日常科技·英语30篇（7）

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为什么LED灯泡寿命长得多

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