In tunnels, safety is a huge concern because our eyes can’t adjust quickly when moving from bright sunlight into sudden darkness. Drivers’ eyes need time to adjust. During those few seconds, they can't see well, Will cause brief visual blindness due to glare, which can lead to a brief visual blind spot (“black hole effect” or “white hole effect”) , a high UGR will increase the risk of accidents by exacerbating this effect.
Good lighting—especially at tunnel entrances—can cut accidents by up to 35%, making it one of the most important safety features. On top of that, tunnels use a lot of energy—about 40% of a highway’s total energy costs!
Smart lighting systems help save energy while keeping drivers safe, making tunnels both efficient and reliable in the long run.
Entrance Zone (Threshold) – High-intensity LEDs (5,000–10,000 lux) ease the transition from daylight, gradually dimming over 50–100 meters to prevent glare.
Transition Zone – Brightness reduces steadily (e.g., 10% every 30 meters) using sensors to balance safety and efficiency.
Interior Zone – Durable, dust-resistant fixtures maintain steady light (150–200 lux) despite pollution and vibrations.
Exit Zone – Light increases gradually to avoid blinding drivers as they leave.
The key to obtaining the desired effect is to choose the right optics. In tunnels, optics based on the reflective principle can be used to anti-glare. This method is not only more effective in achieving greater brightness levels, but also enhances efficiency
ASAHI offers a wide range of beam angles specifically suited for tunnel lighting. our products are designed to meet the quality and optical performance requirements set by many national and global standards bodies.
Different size profiles ensure flexibility and versatility in luminaire design. Outstanding optical designs can also be requested as customized projects.
Asahi Optics welcomes your questions, inquires and feedback. Please use the form below or contact us at any of the addresses below. Our sales team will get back to you shortly.
