Unverified85% confidenceDecision RuleTime unknown
开孔尺寸预留：筒灯标注开孔径75mm时，实际需吊顶预留78-80mm余量，因灯体卡簧需要膨胀空间，开孔过紧会导致卡簧无法回弹固定
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Unverified开孔尺寸需先量吊顶已开孔再选灯，主流开孔为75mm和55mm两档，灯体开孔比标注尺寸大2-3mm留余量，翻新换灯若原孔位不匹配需选带可调卡簧或大尺寸面环的产品遮盖旧孔85% similarUnverified筒灯/射灯开孔尺寸与安装深度要匹配吊顶：常见开孔75mm/85mm，吊顶净空需预留至少80-100mm安装深度，超薄款可低至30mm但散热和寿命打折84% similarUnverified常规住宅吊顶预留开孔尺寸多为75mm，选购前需实测吊顶开孔直径，筒灯外径需比开孔大3-5mm以便卡簧固定，切勿买等于或小于开孔的规格81% similarUnverified挂墙安装的亚克力底板霓虹灯，背板厚度≥5mm才能承重不变形，超过60cm宽的灯牌需要4个以上固定孔位并配膨胀螺丝而非仅3M胶78% similarUnverified多孔位选购看孔间距，五孔与三孔混排要保证间距≥40mm，否则大插头(如电源适配器、绿联充电头)会互相挤占导致无法同时插满，标称8孔实际可用可能只有5-6孔77% similar
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