Unverified90% confidenceDecision RuleTime unknown

读写作业场景应选照度≥500lux（国AA级），照射区域直径≥60cm且中心与边缘照度差＜3:1才能保证桌面均匀不产生阴影

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Unverified照度需满足国AA级标准：桌面中心照度≥500lux、均匀度（最小/平均）≥0.7，仅看'流明'数值无意义，应看厂商公布的桌面照度曲线图78% similar Unverified认准国AA级照度标准（GB/T 9473-2017），中心照度≥500lx且半径50cm处≥250lx，才能满足长时间阅读书写不费眼76% similar

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