地下通道是治安敏感区：照度低了滋生案件，色温冷了显得阴森，人一少监控又看不清脸——三个问题互相纠缠。
地面维持照度15lx、夜间不低于10lx（CJJ45-2015人行地下通道标准），显色指数Ra≥80方便辨认人物衣着；出入口过渡区防眩光，避免内外亮度突变造成『白洞』不适。
我们采用3000-4000K中性光+通道全线感应调光，人流越大越亮、深夜自动提升基础照度，安全感与能耗同时达标。
Underground passages are security-sensitive: low light breeds incidents, cold colour feels eerie, and with few pedestrians cameras cannot capture faces — three problems entangled.
Per CJJ45-2015 underground-footway standards: 15 lx maintained, no less than 10 lx at night, Ra≥80 to make clothing recognisable; glare-controlled entrances smooth the brightness transition and avoid white-tunnel discomfort.
We combine 3000-4000K neutral light with full-length sensor dimming — brighter with more pedestrians, elevated base level at midnight — hitting both security and energy targets.
— 上海曦韵照明｜Shanghai Xiyun Lighting —
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