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Revision of Threshold Luminance Levels in Tunnels Aiming to Minimize Energy Consumption at No Cost: Methodology and Case Studies

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Academic year: 2021

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Figure 1. Diagram of the proposed methodology with the examined scenarios. Lighting Emitting Diodes (LED); threshold luminance (Lth); new corresponding threshold zone luminance (Lth’)
Figure 2. The 11 examined tunnels along the national motorway Patra-ATHens-Efzoni (PATHE) in Greece
Table 3. Installed power and the corresponding energy indicators for the interior zone and nighttime stage of the examined tunnels (the luminaires of the interior zone were installed along the full length of the tunnel).
Figure 3. Photographs, taken from a point at a distance equal to the stopping distance from each of the tunnel portals in the middle of the specific motorway, presenting the parts of sky (%), road (%), surroundings (%), and portal (%) used for the calcul
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