Why the glare form in the tunnel is because that there is the very high brightness or luminance contrast, making the eye function decline or discomfort. The glare of the tunnel lighting comes from oncoming vehicles headlights, tunnel lamps, high brightness outside the tunnel exit. Glare will make people fall on the ability to identify obstacles and endanger traffic safety. Tunnel lighting should be cut light type, taking direct and reflected glare elimination special technical measures, the formation of diffuse reflection, so that light entering the eye is very soft. International Commission on Illumination uses a relative threshold increment (TI) to illustrate the glare causes decline in visual function, ie, a measure of disability glare. European Standards Committee tunnel lighting standards (CR 14380:2003 E), on disability glare provides as follows: during the day inside the tunnel threshold segment and the entire tunnel section and the night, and its relative threshold increment (TI) must be less than 15% . stroboscopic effect Strobe means that since the illuminator is not arranged in a row, the driver constantly exposed to the stimulus generating shading upset in a long tunnel,. It is related to the changing brightness , the changing frequency , the total time of strobe,which is linked with optical characteristics of the lamps , the traveling speed of the vehicle, the lighting installation spacing, the tunnel length. In general,what the flicker is acceptable is that strobe frequency is less than 2.5 and greater than 15Hz . If the vehicle speed is 60km / h is 16.6m / s, lighting installation pitch is 4, so that the frequency of strobe is about 4.2Hz. When designing, choosing the appropriate lighting installation spacing should be taken into account, . If the strobe frequency lies between 4Hz and 11Hz, and lasts is longer than 20s,which will bring that the driver feel obviously uncomfortable. Browse www.lead-lighting.com/led-tunnel-light/led-tunnel-light-cl3-60w.htm, you can know more LED tunnel light and learn about its parameters and scope and why it is suitable for tunnel lighting.
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International Commission, Illumination, Strobe, glare, lighting, LED tunnel light, stroboscopic effect, diffuse, reflection, frequency,
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