What should be noticed in tunnel lighting optical lens design?

According to relevant statistics, the probability of tunnel accidents is significantly higher than that of other sections. One of the main reasons is the unreasonable design of lighting fixtures in the tunnel.

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The existence of the visual phenomenon.

1. Light Curtain phenomenon

The smoke forms due to the aggregation of exhaust gas emitted by vehicles, the lights of headlights will be absorbed and scattered by these fumes. Forming a light curtain and reducing the brightness contrast between the obstacles ahead and their background, affects the visibility of the obstructions and adversely affects the visual function.

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2. The "black hole" phenomenon

The brightness difference between the inside and outside of the tunnel is huge in daylight, if the tunnel is long enough, drivers will see a ‘black hole’, if it’s short, a "black box" is displayed in front of the driver.

When we enter a tunnel from a bright place into dark place, the vision will have a certain adaptation time, and then we can see the situation inside the tunnel, this phenomenon is called the "adaptive lag phenomenon".

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3. The "white hole" phenomenon

On the contrary, when we drive out of the tunnel, the sudden intensity of the light will produce a strong glare on human eyes. ??The front of a white light easily produces a ‘white hole’ phenomenon.

What should be noticed in

So the optical lenses for tunnel lighting require careful consideration of safety, here are some key aspects to focus on:

1. Uniformity of Light Distribution: The primary goal in tunnel lighting is to ensure uniform light distribution to avoid bright spots and dark patches, which will disorient drivers.?Lenses should be designed to spread light evenly across the tunnel’s width and length.

2. Glare Reduction: Minimizing glare is crucial in tunnel lighting to prevent visual discomfort for drivers, and visibility issues. Optical lens design should focus on controlling the beam angle and directing the light downward onto the roadway rather than into the eyes directly.?Brightlx will use some craft to reduce the high UGR during the design period.

3. Light Intensity and Color: Maintaining adequate light intensity that mimics daylight as much as possible helps in easing the transition from outdoor to indoor light conditions, which is important at tunnel entrances and exits. The color temperature of the lighting should also be considered to enhance visibility without being harsh.

4. Durability and Resistance: Lenses used in tunnel lighting must be durable and resistant to physical and environmental factors like vibration, temperature fluctuations, and humidity. Materials that can withstand these conditions without degrading are essential.?Brightlx recommends PC LEV2200KL,1250Z, and PMMA 8N, VH001 with high transparency, anti-scratching and anti-yellowing.

5. Efficiency: Since tunnel lights are operational for extended periods, the optical design should maximize light output while minimizing energy consumption. This involves optimizing the lens design to reduce light loss and ensure that the maximum amount of light is directed toward the required areas.?Brightlx is great at controlling the lighting distribution and putting the light beams in an accurate place with 0 upward lighting ratio, raw material can reach 88%-95% lighting efficiency.

6. Easy Maintenance: Considering the difficulty in accessing tunnel lighting for maintenance, lenses should be designed to be easy to clean and replace. Equipped with 480T plastic injection machines, Brightlx can offer one-piece LED lens arrays that are easy to install and replace.

7. Adaptability: The lens design should be adaptable to different sections of the tunnel, as the lighting needs can vary from the entrance to the interior and then to the exit. Variable lighting conditions may be required to adapt to the luminance changes that the human eye perceives as it moves through different light intensities.

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By focusing on these elements, optical lens design for tunnel lighting can effectively enhance safety, improve visibility, and ensure energy efficiency.