A Complete Collection of 100000 Whys
Fav十万个为什么
为什么节能灯关后微微发亮？
简单的摘要：节能灯关后微微发亮的原因主要是开关控制零线而非火线、灯具漏电以及LED灯珠对电流敏感。
1、开关控制零线而非火线：如果开关仅切断零线，火线仍与灯具连接，此时灯具内部的整流桥堆和电容会继续工作，导致LED灯珠两端产生微弱电压，从而发出微光。
2、灯具漏电：部分节能灯由于质量问题，可能出现漏电现象。即使关闭开关，漏电产生的电流也会通过灯具内部的电路，使LED灯珠发出微弱亮光。
3、LED灯珠对电流敏感：LED灯珠对微弱电流非常敏感，即使在没有形成完整电流回路的情况下，也可能因为感应电流或残留电压而发出微光。这种现象在节能灯中较为常见。
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