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ED電球
https://ja.wikipedia.org/wiki/%E3%81%8A%E3%81%98%E3%82%83%E3%82%8B%E4%B8%B8%E3%81%AE%E7%99%BB%E5%A0%B4%E4%BA%BA%E7%89%A9%E4%B8%80%E8%A6%A7#%E5%9D%82%E3%83%8E%E4%B8%8A%E5%AE%B6