什么是开放式额定灯泡（中底座）
开放式灯泡（中底座）是指设计用于开放式灯具的灯泡，在使用过程中灯泡会暴露在外。它采用中型灯头（E26），这是许多类型灯泡的标准插座尺寸。所谓 "开放式"，是指灯泡适用于不完全封闭灯泡的灯具。这种灯泡的灯颈通常比标准中型灯头的灯泡窄，适合安装在开放式灯具的排他性中型插座中。它不适合用于全封闭灯具。
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