适用电压
灯具常见电压：AC220V（高压）/DC12V/DC24V（低压）。
交流电：大小和方向随着时间做周期性变化的电流，简称AC。
直流电：与交流相反，简称 DC。
浪涌：超出正常工作电压的瞬间过高电压，来源分为外部（雷电原因）和内部（电气设备启停和故障等）
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