Abstract
LEDs are widely applied in highways and tunnels for their long life, low light attenuation, and being environment friendly in recent years. The influence of correlated color temperature (CCT) of LED on lighting safety has attracted people’s attention as the demand increased. In this paper, a calculation model of perception luminance of human eye considering mesopic vision and fog concentration was proposed. The influence of different CCTs on perception luminance of human eye under different levels of fog concentration and luminance was calculated and analyzed. The CCT of LED employed in the interior zone of a tunnel was selected based on the highest perception luminance in mesopic vision. Seven kinds of LEDs with different CCTs (3000–6500K) were applied in the experimental system with adjustable fog concentrations. The results showed that the main factors affecting visual perception are luminance and fog concentration. Higher luminance or lower fog concentration provides drivers with higher perception luminance. In contrast, although CCT has a less effect on perception luminance, LEDs with higher CCT (about 6500K) can provide higher perception luminance considering fog in mesopic vision. This paper provides technical support for tunnel lighting and guaranteeing traffic safety.
Highlights
Tunnel lighting is an important aspect of ensuring traffic and transport safety in highway tunnel
In China, the Guidelines for Design of Lighting of Highway Tunnels JTG/ T D70/2-01—2014 (JTG) divided the tunnel into four parts with different luminance requirements. e luminance of the entrance zone and exit zone is designed to be higher in order to reduce the influence of luminance difference between the inside and the outside of the tunnel on traffic safety in the daytime
Taking advantage of the adaptation of the human eye to the dark, the luminance of the interior zone is designed to be minimal in order to save energy. e tunnel division in four parts can provide a universal reference for the tunnel lighting design, while ensuring the safety of driving to maximize energy saving
Summary
Tunnel lighting is an important aspect of ensuring traffic and transport safety in highway tunnel. E tunnel division in four parts can provide a universal reference for the tunnel lighting design, while ensuring the safety of driving to maximize energy saving. Due to the semienclosed structure of the tunnel, the particles emitted from motor vehicles and deposited dust can hover for a long time in the air by gravity and cause a foggy condition. Both low luminance and fog conditions will pose a real threat to driving safely in the interior zone, and as a result, improving the visual quality of drivers by studying tunnel lighting is of significant importance
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