Unverified80% confidenceDecision RuleTime unknown
灯头宽度和悬臂长度决定照射面积，读写用需灯头长度≥30cm、悬臂能覆盖整张书桌宽度；小灯头护眼灯照亮范围窄，边缘暗导致眼睛频繁调节疲劳
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Unverified读写台灯发光面应采用导光板或大面积漫射设计而非裸露LED灯珠，避免眩光；有效照明区直径应≥40cm覆盖整张书桌宽度85% similarUnverified书桌阅读优先选立式/大力钳类台灯，出光口宽度≥30cm可实现整桌面均匀照明，圆形小灯头照射范围窄易产生阴影85% similarUnverified落地大屏护眼灯不适合桌面空间小于60cm的书桌：大发光面需要足够高度和距离才能覆盖，桌面过小时光斑集中反而降低均匀度，此类场景选可调灯臂的座式灯更合适84% similarUnverified落地式或大灯头护眼灯的照射直径通常比小台灯大，能覆盖A4纸整页避免边缘明暗差，桌面大或需照亮整个书本时更适合84% similarUnverified灯头照射范围越大越均匀但灯体越占空间，小书桌（宽＜80cm）选长条形灯头兼顾覆盖与占位，大书桌需可旋转灯臂83% similar
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