It goes without saying that tunnel LED lighting must be safe, yet there are still obstacles to overcome. The black hole effect poses the greatest danger to tunnel lighting. Let’s look at the environmental changes along the tunnel to figure out what’s causing the black hole effect. The graphic depicts you as a driver on the open road (during daylight hours) approaching a tunnel. Because of the reflection of sunlight, the surrounding environment is bright. And you feel safer because you can see what’s going on around you. However, the tunnel’s entrance looks to be a black hole because it is much darker than the open road. The high brightness contrast obstructs your vision and puts your worry and insecurity at risk. You can adapt to the gloomy tunnel thanks to visual adaptation. However, the visual adjustment takes time. It is quite risky to drive during this time. Visual adaptation must take place before entering the tunnel. Your vision is otherwise hazy. You get used to the decreased brightness within the tunnel after a while. When you’re ready to exit the tunnel, the lighting levels outside the tunnel are higher than the lighting levels inside the tunnel. The brightness contrast may obstruct your vision once more. To facilitate visual adaptability, tunnel lighting is divided into five zones, each with differing illumination requirements. The lighting should be stronger at the entrance and gradually dim inside the tunnel. The lighting level is enhanced when you depart the tunnel. ZGSM introduced high-efficiency tunnel lighting and underpass LED lights. H, HB, and ZOOM series LED tunnel lights for sale.