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Tunnel lighting to achieve energy savings, improve the lighting effect and ensure the safety and comfort of driving considerations

Views:311     Author:Site Editor     Publish Time: 2021-11-11      Origin:Site


In our daily life, we will inevitably pass through tunnels when driving on the road. So what are the ways to achieve energy saving in tunnel lighting, improve the lighting effect of LED tunnel light, and ensure the safety and comfort of driving? What aspects need to be considered? Let's take a look together below.


This is the content list:

  • Brightness

  • Glare

  • Strobe Effect

  • Lighting Control


Brightness

As the brightness outside the tunnel is much higher than inside the tunnel during the day, so when the driver drives into the tunnel, the vision needs to have a certain amount of time to adapt, and then can see the situation inside the tunnel, this phenomenon is called "adaptation lag phenomenon", if there is no appropriate transition, it will produce a black hole phenomenon, so that the driver temporarily lost This phenomenon is called "adaptation lag", if there is no proper transition, it will produce a black hole phenomenon, so that the driver temporarily lost the normal visual function, which will bring certain safety risks. The black hole phenomenon is a visual problem that occurs before entering the tunnel and is the most important issue in tunnel lighting. For this reason LED tunnel light tunnel lighting is usually divided into entrance lighting, interior lighting, and exit lighting. Which daytime LED tunnel light tunnel entrance lighting brightness is to be determined according to the brightness of the tunnel outside, speed, the entrance field of view, and the length of the tunnel. The threshold section is to eliminate the "black hole" phenomenon, the transition section of the lighting level further gradually decline, to provide drivers with visual dark adaptation time.


Overall luminance uniformity U0 is the ratio of the minimum luminance and average luminance on the road surface of the inner section of the LED tunnel light, and the longitudinal uniformity U1 is the ratio of the minimum road surface luminance and the maximum road surface luminance on the lane axis. If the LED tunnel light road surface continuously, repeatedly appear bright band and dark band, that is, the "zebra effect", for the road users traveling in this lane, will feel very annoying. This problem is related to human psychology, but also endangers road safety, and the longitudinal uniformity is mainly used to evaluate the size of the "zebra effect".


Glare

Glare is caused by the presence of extremely high luminance or luminance contrast in the field of view of LED tunnel light, which reduces the visual function or makes the eyes feel uncomfortable. Glare in LED tunnel light tunnel lighting can come from the headlights of oncoming vehicles, LED tunnel light, the high brightness outside the tunnel exit, etc. Glare will make people's ability to identify obstacles is reduced, endangering the safety of driving. LED tunnel light should be cut-off type, take special technical measures to eliminate direct and reflected glare, the formation of diffuse reflection, so that the light is very soft into the human eye.


The International Commission on Illumination has adopted a relative threshold increment (TI) to account for the reduction in visual function due to glare, i.e., the measurement of disabling glare. The European Commission's standard for LED tunnel light (CR 14380:2003E) specifies the following for disabling glare: The relative threshold increment (TI) must be less than 15% for the threshold and interior sections of the tunnel during daylight hours and for the entire LED tunnel light tunnel at night.


Strobe Effect

Strobe refers to the discontinuity of the LED tunnel light illuminator arrangement in longer tunnels so that the driver is constantly irritated by the stimulation of light and dark changes. It is related to the LED tunnel light brightness changes, the frequency of light and dark changes, the total time of strobe. These three are related to the optical characteristics of the LED tunnel light used, the speed of the vehicle, the distance between the installation of the illuminator, and the length of the tunnel. Generally speaking, the strobe frequency is less than 2.5 and greater than 15Hz.


Lighting Control

Advanced LED tunnel light lighting control method is an important technique to ensure visual conditions and meet the LED tunnel light tunnel lighting requirements with reasonable energy saving. The purpose of LED tunnel light lighting control is to be able to change the lighting level of the tunnel at any time. Due to cloudy days, rainy days, or dusk, the brightness outside the tunnel entrance is much less than usual, so there should be appropriate measures to reduce the level of LED tunnel light lighting in the entrance section to reduce unnecessary energy waste. In LED tunnel light tunnel lighting can be based on daytime, night, and the size of the traffic flow and other factors, through a variety of dimming equipment or LED tunnel light control devices to adjust and control the illumination of the tunnel lighting environment or light on and off. At present, most foreign countries use light-sensitive devices, dimmable electronic rectifiers, and other components of the intelligent lighting system, so that the overall brightness of the LED tunnel light is diminished, energy consumption is reduced. At the same time, LED tunnel light ensures the uniformity of tunnel brightness remains unchanged.


CECEP Latticelighting in LED lighting products, intelligent lighting solutions, energy-saving mode, and other aspects of the overall advantage. The above is the tunnel lighting to achieve energy savings, improve the lighting effect and ensure the safety and comfort of traffic considerations if you are interested in LED tunnel lights can contact us, our website is www.latticelighting.com.


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