According to the International Committee on Illumination CIE recommendations, luminance should be monitored as the luminance contained within in a conical field of view, subtending an angle of 20º. It is recommended that a luminance photometer is mounted in the tunnel approach road approximately 120 - 200 metres from the portal, depending on the approach speed of the vehicles and their stopping distance. The purpose of monitoring the luminance at the portal is to adjust the level of light intensity inside...
By Codel International Ltd Office in Keswick, PENNSYLVANIA (USA).
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you