Unverified80% confidenceDecision RuleTime unknown
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
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Unverified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81% similarUnverified开孔尺寸越大（如100mm/150mm）单灯功率和亮度可更高、光斑更柔和，但对吊顶开孔精度和整体密度布局要求高；小开孔（75mm）更精致隐形但需更多数量才能达到同等照度79% similarUnverified导光管管径选择需匹配采光面积：直径250mm约照亮8-12㎡，直径350mm约照亮15-20㎡，530mm可覆盖25-35㎡，选型时按房间面积÷12反推最小管径78% similar
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