城市隧道车流密、洞口近、弯道多，『黑洞效应』比公路隧道更突出；传统恒定亮度方案在深夜空隧时浪费惊人。
按JTG/T D70/2-01-2014：入口段亮度按洞外亮度L20(S)折减系数动态计算，中间段80km/h时2.5cd/m²；必须配置随洞外亮度与车流量联动的无级调光系统，LED整灯光效≥130lm/W。
我们提供隧道专用调光回路设计——洞口亮度计+车检器双信号输入，灯具0-100%平滑调光，实际运营电费比定亮度方案省60%。
Urban tunnels combine dense traffic, close portals and sharp curves, making the black-hole effect worse than on highways; constant-brightness schemes waste staggering energy in empty late-night tunnels.
Per JTG/T D70/2-01-2014: threshold-zone luminance is dynamically derived from access-zone luminance L20(S); interior zones 2.5 cd/m² at 80 km/h; stepless dimming linked to exterior luminance and traffic flow is mandatory, LED efficacy ≥130 lm/W.
We design dedicated tunnel dimming loops — dual input from portal luminance meters and vehicle detectors, 0-100% smooth dimming — cutting real operating cost by 60% versus constant-brightness schemes.
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