LED tunnel light project in ShangHai
Tips on LED Tunnel Lights
Traffic noise, vibration, contaminated air, corrosive gases, wetness, and other adverse situations contributed to the particularity of tunnel illumination. The following analyses explore tunnel lighting design concepts and methodologies in order to provide vehicle traffic and pedestrians with a safe and pleasant lighting environment.
In contrast to road-led tunnel lights, illumination has a unique uniqueness, and security issues in the lighting system are especially significant.
Consideration of transition and transition lighting design, as well as the human aspect in light and dark adaptation, are all important in the design of tunnel lighting solutions. To guarantee that the driver’s eyesight meets specific standards at a dark tunnel entrance, transitional lighting is necessary. The time lost during tunnel departure due to adaptation is relatively brief—generally less than 1 second—and might be employed for other operations.
Tunnel light led
There are often multiple distinct tunnel vision issues:
(A) Prior to entering the tunnel (during the day): The “black hole” effect will be seen at the tunnel entrance due to the extreme brightness variations between inside and outside the tunnel.
(2) into the tunnel (during the day): light outside into the automobile via a very dark tunnel even after a certain amount of time to pass through in order to observe the situation within the tunnel, a phenomenon known as “adaptation lag.”
(3) Tunnel entrance Daytime driving through a long tunnel causes the export to appear to be a “white hole” with a strong glare, making the driver uncomfortable. Night and daytime driving, on the other hand, causes the export to appear to be a black hole with no light, making the driver unable to see outside the linear and road obstacles.
Greater needs for tunnel lighting were prompted by a number of additional unique visual issues. The following factors may be used to effectively address these issues.
Settings for a tunnel’s illumination
To adapt stage, transitional stage, the fundamental and outlet portions of five lights are often separated into tunnel lighting, where each section has a particular role:
For example, in the daytime, assuming that the tunnel mouth ambient brightness is 4000cd/m2, speed is 80KM/H, then the minimum requirements introduction of the length and brightness are 40 m and 80cd/m2, respectively. This eliminates the “black hole” phenomenon and allows the driver to see obstructions in the hole place.
(2) adaptation period: After entering the tunnel, the driver may adjust fast and get rid of the “black hole” phenomena; based on the aforementioned circumstances, the length and brightness that required adaptation were 40 m and 80 46cd / m2, respectively.
(3) TRANSITION: progressively adjust to the driver’s inside-tunnel illumination; based on the aforementioned criteria, the length and brightness of the transition section are 40 m and 40 4.5cd / m, respectively.
(4) Basic Sections: Inside the tunnel, basic illumination
(5) Exit Section: The general practice is to use the street as a continuation of lighting outside the cave during the day so that the driver can gradually adapt to the exit of the light, eliminating the “white hole” phenomenon; during the night so that the driver can see in the cave outside the linear and road obstructions eliminate the exit of the “black hole” phenomenon.
Basic lighting within the tunnel should be more than the value of high brightness during the daytime at the exit of the inlet portion of the same illumination illumination; however, during the night, it should be less than the basic lighting brightness values.
When there is street lighting outside the tunnel, the surface brightness within the tunnel must be at least twice as bright as outside.
There are issues with the car when it passes through the tunnel.
1 issues that cropped up on the course close to the tunnel
Occurrence of black holes
When the eyes are exposed to a few cd/m2 of brightness tunnel environment, the human eye’s perception of brightness difference is limited, appear to adapt hysteresis, and you will see a black cave, while the state does not recognize them. During the day, the eyes have adapted to outdoor motor vehicle drivers up to 100000 lx cd/m2 over thousands of natural light. want to see the so-called black hole phenomena in a bright setting. When a black hole phenomena occurs while a car is near to a tunnel, the driver’s vision shortens the distance, making it unsafe to drive. Before experiencing tunnel vision issues, black hole phenomena occurs, making tunnel illumination the most crucial difficulty. This portion of the length of the braking distance is somewhat greater than the safety of the vehicle in order to avoid the development of black holes, commencing from the tunnel entrance within a distance adequate to assure brightness.
(1) The driver can’t adjust to the tunnel vision brightness fast, making it challenging to observe the situation within the tunnel since there is a significant variation in light between outside and inside the tunnel. To avoid this, you should make the tunnel entrance brightness with reduced visual adaptation is slow, smooth transition to the brightness, the brightness should be gradually reduced, but the first one after a brightness and brightness ratio not exceeding 3:1, and these walls cannot be lower than the corresponding average surface brightness brightness at a height of 2 meters.
(2) Issues arise in the tunnel while High brightness, lower brightness at night than during the daylights in the tunnel during the day. Consider a long tunnel with heavy traffic; the smog-forming emissions can’t dissipate quickly, absorbing and scattering light, reducing visibility, making visual identification challenging; the front lights are affected by the smog and can’t provide the necessary legibility; the front surface luminance is half-100m, which is typically twice as bright as the lighting up of exhaust gas.
(3) near the issues that emerge at the tunnel exit
When you look through an export of high brightness outdoors, the exports seem to be a bright hole. This phenomena is known as the “white hole phenomenon,” and it turns the exports into a white cave. In order to match the size of the vehicle identification created illumination called exit lighting, exit lighting interval length of tens of meters, but in a huge van with the rear of cars and trucks shadows coincide difficult to notice, in heavy traffic near the exit of the tunnel. Before the issues, 4 nights were hauled out of the tunnel.
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The road outside the tunnel has turned into a dark hole at night, making it impossible to see the alignment of the road or the existence of hazards. This time, the tunnel exit should simply be left on the road. In order to obtain the proper degree of brightness, a longer safe braking distance is typically comparable to a few seconds between each motor vehicle and the road. Third, LED applications in tunnel lighting use LED products with clever dimming controls that automatically modify illumination intensity based on the amount of light entering the tunnel. The lamp life is 6 to 8 times longer than standard tunnel lights, resulting in a 45% reduction in energy consumption compared to traditional programs, which also lowers light loss and maintenance costs significantly.